Science topics: GeosciencePaleontologyPaleoclimatology
Paleoclimatology - Science topic
Paleoclimatology (palaeoclimatology) is the study of changes in climate taken on the scale of the entire history of Earth.
Questions related to Paleoclimatology
I am looking for shell chemistry analysis to address the paleoclimate.
I would like to know your opinion about what are currently the greatest unsolved problems or opportunities for further research in palaeoclimatology.
Are there data on GDGT in surface sediment to calibrate the paleotemperature in northeastern Brazil or in its vicinity?
Or what would be another suitable proxy to achieve paleotemperature over the continent?
I appreciate the collaboration,
Hello Everyone, I have carried out the XRD analysis of clay minerals on oriented samples. Now i want to do the semi quantitative analysis as well as calculating the illite crystallinity using the TOPAS software. Can anyone from the research community guide me how to carry out this process on TOPAS. I am new to this software and also i couldn't find any tutorials regarding the semi quantitative analysis of clay minerals of on any platform.
Any guidance would be highly appreciated.
I do research on Vietnamese history in the beginning of AD. I have found "World Data Service for Paleoclimatology" data on the page
I hope d13C and d18O measurements can show the precipitation regime in the North of Vietnam between 40 and 50 AD. Will anyone help me?
Thank you all.
Hallast et al. (2021) recently published a research paper that proposes East Asia as the geographic point of origin for non-African Y-chromosome lineages. I disagree. My analysis of the genetic, paleoclimatological, and archeological data (St. Clair 2020) defines the Levant as the source region. A summary of my arguments is as follows:
1) Homo sapiens evolved in Africa.
2) The Y-chromosome data support a single out-of-Africa migration during Marine Isotope Stage 5 (between 71 and 130 thousand years ago).
3) Admixture between humans and Neanderthals support human occupation of the Levant during Marine Isotope Stage 5 (between 71 and 130 thousand years ago).
4) The paleoclimatological evidence supports an out-of-Africa migration into the Levant during Marine Isotope Stage 5 (between 71 and 130 thousand years ago).
5) The fossil evidence supports an out-of-Africa migration into the Levant during Marine Isotope Stage 5 (between 71 and 130 thousand years ago).
6) Fossil evidence supports human occupation of the Levant during Marine Isotope Stage 4 (between 57 and 71 thousand years ago).
7) The paleoclimatological evidence supports human occupation of the Levant during Marine Isotope Stage 4 (between 57 and 71 thousand years ago).
8) Dating estimates for haplogroups D-M174, E-M96 and C-M130 support human occupation of the Levant during Marine Isotope Stage 4 (between 57 and 71 thousand years ago).
9) The fossil record sets the human colonization of Europe, East Asia, and Australia during Marine Isotope Stage 3 (between 29 and 57 thousand years ago).
10) The paleoclimatological record sets the human colonization of Europe, East Asia, and Australia during Marine Isotope Stage 3 (between 29 and 57 thousand years ago).
11) The phylogeography of Y-chromosome variation and dating estimates support the human colonization of Europe, East Asia and Australia during Marine Isotope Stage 3 (between 29 and 57 thousand years ago).
East Asian origins of non-African Y-chromosome haplogroups, as proposed by Hallast et al. (2021) is problematic for the following reason: any Y-chromosome mutations that may have evolved in the region during Marine Isotope Stage 4 would have perished because of the cataclysmic Toba volcano explosion that occurred in Indonesia about 75 thousand years ago (for more details, see Rampino et al. 2000; and Wei and Li 2017).
Hallast, Pille et al. 2021. “A Southeast Asian origin for present‑day non‑African human Y chromosomes.” Human Genetics (2021) 140: 299-307.”
Rampino, Michael R. and Stanley H. Ambrose 2000. “Volcanic winter in the Volcanic winter in the Garden of Eden: The Toba supereruption and the late Pleistocene human population crash.” Geological Society of America Special Papers 345: 71-82.
St. Clair, Michael R. 2020. “The Prehistory of Language from the Perspective of the Y-Chromosome.” The Genetic-Linguistic Interface Project. Preprint. DOI: 10.13140/RG.2.2.26725.01760
Wei, Lan-Hai and Hui Li 2017. “Fuyan human of 120–80 kya cannot challenge the Out-of-Africa theory for modern human dispersal.” Science Bulletin 62: 316-318.
I'm interested in patterns of Palaeoenvironmental variability in the Senegal Valley during the Middle and Upper Pleistocene, particularly in the lower valley after the confluence with the Faleme River. However, I am having trouble finding modern sources of information, and many older sources are not available on-line. Can anyone help direct me to available/key resources that document patterns of environmental variability in the Senegal Valley?
I am interested in the Cenozoic history of surface circulation in the Atlantic Ocean, particularly in the subtropical and tropical regions. However, most information I have found so far is related to the North Atlantic.
In particular, I would like to know if the main currents and countercurrents have changed their intensity, in response to climatic and tectonic dynamics during the last 66 million years. What are the evidences for these changes? What literature would you recomend for solving questions on this topic?
Many thanks in advance.
I'm interested to know about what are currently the biggest unsolved problems or opportunities for further research in Holocene. And particular focus in Arabian Sea/Northen Indian Ocean sector.
Greetings, I was willing to reconstruct paleo-temperature of Last Glacial Maximum (LGM) from the oxygen isotope ( δ18O) or Mg/Ca ratio. Therefore. I obtained data from the Pangaea site and arranged them in 3 columns depth, time (Kyrs BP), parameters. The δ18O data were calculated based on G.ruber and benthic, planktonic foraminifera. While the Mg/Ca ratio was extracted from H. elegans.
Now, I am wondering whether I could use any equation(s) that would take the previously mentioned parameters into variables and reconstruct paleo-temperature. I studied some literature where I found the following equation published by McCrea (1950), which was subsequently revised by Epstein et al. (1953):
T(°C) = 16.5− 4.3(δ18Occ − δ18Osw) + 0.14(δ18Occ−δ18Osw)
where δ18Occ is the measured value in calcium carbonate and δ18Osw is the isotope ratio of the water from which it is precipitated. The slope of this relationship means that a 0.23‰ increase in δ18Occ corresponds to a difference of about 1°C (Paul N. Pearson, 2012). I understand that I would put the Isotope ratio's column in the δ18Occ variable, but what should I do about the δ18Osw variable ? As I am planning to derive the paleo-temperature of the LGM, I was wondering that if there's any standard δ18Osw value of that time or do I need separate dataset for that too?
Regarding the ratio of the water, there was something such as conversion of VSMOW/SMOW to VPDB/PDB scale, I would be grateful if someone clarified these with their expertise. Although I do believe my data is already converted to PDB when I downloaded from Pangaea. It also needs to be mentioned that these dataset are from cores in Bay of Bengal. Finally, I welcome any suggestion, advice or tips to reconstruct temperature from the data I gathered. If my approach is wrong, it would be a great help to me if you could me point me out to the right directions or the right equations. I am attaching some screenshot here as well. Thanks in advance.
I would like to compare the analysis of the grains of pollen grains with other proxies in paleoclimatological studies.
I have trace element data (using ICPMS) of the bulk sediments from the lake bottom.
I would like to calculate the elemental ratios (e.g., Rb/Sr; Sr/Ca, etc.).
Is there any method available to calculate apportionment of Sr in both silicate or carbonate fractions?
What kinds of additional parameters, do I need for this calculation?
Rhymites are indicator of sea level change, tides, glaciation and change in paleoclimatology. Does salinity play role to form tidal rhymites?
I will use climatological models in my research work but I have not yet mastered any programming language, now I would like to have advice on the choices to start.
I am planning to work with open source paleo-climate data for a thesis, so far the only source for these kind of data i know is : https://www.ncdc.noaa.gov/paleo-search/
Is there any other sources that provides a good amount of paleo-climate data or this the most available source currently ?
With that being said, would any paleo-scientist like to tell me what are some of the special things that you take into consideration while you are dealing with such data, especially because they are from past and mostly climatic reconstruction or proxies ? If you went through that link, you'd see most of them are in (.txt) files, therefore what would be some potential software or programming languages you have used or planning to use, that would be helpful in this regard ? or you'd process it like any usual data (e.g. netCDF are very popular in climatic studies but unfortunately i don't know whether (.nc) files exists for paleo-climate data)?
Any advice or suggestions, in addition to my question would be deeply appreciated.
I am interested in both temperature and rainfall variability at a continental scale.
Urgent - trying to find a program that will convert a scanned pollen diagram into either graphs, a digital, clearer pollen diagram or data tables.
Some time ago, I have seen a paper referring the size of WPWP, possibly using dynamic SST or heat budget？ that means the size of WPWP was definited by heat budget not SST for Holocene and LGM. The conclusion is LGM WPWP size is similar to the Holocene. But, I can not find the paper! If you know this, Please send me this referene.Thanks
I guess it is necessary that our earth enter in glacial age to avoid global disaster. The earth freezing will cool down seismic and volcanic activities to be minimum.
What is your opinion?
As part of a Ph.D study on Early Jurassic sedimentological, climatic and environmental changes, we are currently studying the significance of condensation and the deposition of phosphate-rich sediments in Switzerland. We are determining if this phenomenon is linked to global oceanographic-climatic changes or to the more regional tectonic constellation and the presence of local highs. Therefore, we would be glad if you could help us to inventory the distribution of condensation and phosphate enrichment during the Early Jurassic. We are especially interested in the occurrence of condensed phosphate-rich sediments in Europe but also welcome indications of sites in other parts of the world.
Schöllhorn Iris, Thierry Adatte and K. Föllmi (University of Lausanne)
Do you know of references that contain good figures, graphs, displaying the differences in climate patterns between late Pleistocene and Holocene?
MWP-1C (Melt water pulse)was termed in Liu et al.,2004.In western pacific area, rapid sealevel rise occured 9.8-9.0ka BP,with the rate nearly 25mm/a. I am eager to konw are there any other geological evidence of rapid sealevel rise at this timespan?
8.2 sealevel jump was attributed to the abrupt collapse of Laurentied Ice sheet and out burst of glacial lakes(Agassia and Ojibway).
So,What's the difference and connection between MWP-1C and 8.2 sealevel jump? (timespan, amplitude of sealevel rise, sources of meltwater....)
Thank you very much!
Central Pacific Basin has water depths between 5000-6000 meters and is away from continents. There are not volcanos and hydrothermal fluids. Commonly, in glacial period, ocean water temperature is lower than that in interglacial period, which is not suitable for living. But why does glacial period have higher biological productivity? Does that means nutrient matter like phosphorus is more rich in surface water in glacial period?
The source of the marine waters of the Zechstein Sea.
The late Permian East Irish Sea Basin equivalent of the Zechstein Sea is called the Bakevillia Sea because the biota found there originated from the Boreal Sea to the north of Pangea. Likewise Peryt et al. (2012) in their analysis of the biota for the Werra Cycle of the Southern Permian Basin of Europe established that the original Zechstein Sea basin flood was with cold Boreal seawater and that the Zechstein Sea was originally temperate to cool.
Why the temperate/cool waters of the initial Zechstein Limestone basin in its central locations became warm, remains enigmatic (Peryt et al., 2012).
Can anyone provide me with field evidence that the second Zechstein Sea cycle biota was Tethys Ocean in origin derived from warm waters flooding in from the east?
Hypothesis: Is it possible for a dual source origin of the Zechstein Sea marine waters? Cold low-salinity low-density Boreal Sea water derived from the north stratified above warm high-salinity high-density Tethyian water derived from the east?
Peryt, T.M., Raczyński, P., Peryt, D. and Chłódek, K., 2012. Upper Permian reef complex in the basinal facies of the Zechstein Limestone (Ca1), western Poland. Geological Journal, 47(5), pp.537-552
The planet has suffered dramatic climatic changes in the Pleistocene, with several peaks of cold (glacial) and warm (inter-glacial) conditions. I ask what do you think about the role of the Central American isthmus appearance, breaking important ocean currents, and probably altering regional or global climate. For example, "El Niño" southern oscillation is a recent climatic phenomenon and is related to the emergence of the Central American isthmus? Thus, in general, what would be the role of this isthmus and the overall climate oscillation during the Pleistocene and Holocene? Thanks!
Wanting to understand relationship of palynological and sedimentological data to climate; looking for data on rainfall and temperature
The Greenland ice core from North GRIP (NGRIP) contains a proxy climate record across the Pleistocene– Holocene boundary of unprecedented clarity and resolution. Analysis of an array of physical and chemical parameters within the ice enables the base of the Holocene, as reflected in the first signs of climatic warming at the end of the Younger Dryas/Greenland Stadial 1 cold phase, to be located with a high degree of precision.
I am studying the Pleistocene/Holocene boundary worldwide.
How to study Cretaceous benthic foraminifera from fragile carbonate material? You can also suggest suitable literature.
some reconstruction shows little or no change from current conditions in low latitude regions and significant warming of the ocean surface at mid and higher latitudes of both hemispheres. how to explain that?
What is the name of this species?
the umbilical side of the specie presented before was obstrued by sediment. these new pictures represent the same specie after using an ultrasonic cleaner, the obstrued umbilic side was cleaned.
Origin of the sample: Ivory Coast offshore (West Africa Guinean Gulf)
depth: -490 m MD (Measured Depth)
The continental drift is a reality now, supported by the dynamics of plate tectonics and seafloor spreading. Continuous convergence (collision) and divergence (separation) of continental and oceanic plates from each other has been reshaping our Earth since the initiation of the process. Therefore, the absolute location (latitudinal and longitudinal) of places has been changing with the change of associated biotic and abiotic environments (tropics shift to equator, or polar regions being shifted to mid latitudes for example).
Then, how the shape of the earth arises due to the continuous movement of the continents and oceans is impacting the global climate? Does it also impact the paleoclimatic records which are being considered to understand the climate of the past?
Are these fossils some kind of Belemnites? They were displayed in Marrocos... One of my students showed me the picture...
Global warming = Ice melting = Sea level rise = More water availability for evaporation and (possible) decrease of salinity = More evaporation = More clouds = Less solar radiation to earth = Global cooling = Fresh ice formation = Sea level fall = Less water availability for evaporation and (possible) increase of salinity = Less evaporation = Less atmospheric clouds = More incoming solar radiation = Global warming again.
(1) Are these consequences always true?
(2) If not, then what are the alternative circumstances?
(3) How does ever-changing Global Climate maintain its Dynamic Equilibrium with Global Water Cycle? Which one is the initiator of Change? Any evidence?
(4) Is there any long term record of salinity of oceanic water?
**Note: Above are the physical factors (components) for global change and associated consequences... excluding biological factors such as changes of concentration of Oxygen/Carbon-dioxide/Methane etc. and their inter-relation which also influence the global cycle.
UPDATE: Few Related & Interesting References (referred by the experts with their answers)
(IPCC Working Group Reports, referred by Harry ten Brink and Commenter)
https://nsidc.org/sites/nsidc.org/files/files/NRCabruptcc.pdf (referred by Alastair Bain McDonald)
https://www.newscientist.com/article/dn11462-climate-change-a-guide-for-the-perplexed (referred by Yuri Yegorov)
http://isthereglobalcooling.com/ (referred by Yuri Yegorov)
https://nsidc.org/cryosphere/sotc/ (referred by Yuri Yegorov)
https://en.wikipedia.org/wiki/Past_sea_level (referred by Yuri Yegorov)
http://www.antarcticglaciers.org/glaciers-and-climate/ (referred by Steingrimur Stefansson)
https://en.wikipedia.org/wiki/Greenhouse_gas (referred by Henrik Rasmus Andersen)
http://www.giss.nasa.gov/research/ (referred by Alastair Bain McDonald)
https://www.ncdc.noaa.gov/data-access/paleoclimatology-data/education-outreach [Click Introduction to Paleoclimatology] (Commenter)
http://www.ncdc.noaa.gov/sotc/ [For Global and Regional Analysis of (1) Climate, (2) Hazards, (3) Snow & Ice, (4) Upper Air, and (5) ENSO events .....during late 1990s to till date] (Commenter)
...for refence see the Global Major Climate Events (originally source & compiled map credit NOAA-NCDC and WMO) during year 2012, 2013, 2014, 2015 and some images related to historical trend of global temperature (Images collected from various webpages referred here)...
My question is base on one of article of “ Strategies Paleoenviromental Reconstruct Archeaology by D. F .Dincauze. Due to that , Understanding the nature of periodic climate change is important for developing a model of the mechanisms that drive global climate change. The impact of these changes is often significant, and knowledge of the ecological and physical responses to these changes gives important information about the sensitivity of ecosystems to climatic variability.What I want to know , the modle that we build as reconstruct pattern, will it be always Relative
What can possibly cause such shifts in the climate system at mid latitudes and at low-latitudes ?
Maybe the climatic models are misleading, the tectonic models wrong, and the floras not comparable.
Related to paleoecology and latidudanal controlled facies.
Hi everybody, I'm to work for my PhD thesis in Agropaleoclimatology or Paleoagroclimatology. In field of tree rings, stream reconstruction, pollen or other proxies is there interesting topics in this field (paleo agro)? Is there a connection between agroclimatology and paleoclimatology? please guide me in choosing the perfect theme.
I want to apply several diversity index in a rodent community from the Neogene to check the diversity inside their families and correlating with climate change and I wanna know what are the best index to do it.
Are there any papers about "Pressure And Temperature effects on gypsum-anhydrite transformations"? (Particularly including recent lab . researches)
I am interested in the theories and evidence linking the AMO to Atlantic Meridional Overturning Circulation, solar forcing and possibly other causes in explaining this phenomenon. Is there literature reviewing these mechanisms? Do you have links to relevant net sources.
I need to know about the role of paleoclimate in that time interval and how it affected the distribution of vertebrates.
I mean the temperature in the Philippine islands or its ambient maritime landmasses rather than its ambient surface ocean.
I'm interested to know more about this field. Can someone help me to know more about paleoclimatology methods to reconstruction of past climate of the Earth?
I am looking for information on advanced courses in English that would be open for graduate or post-graduate level foreign students. This would be interesting for students specializing on climate reconstruction, past climate dynamics, current issues of climatology, and so on. Is there any web-sites listing such activities?
Proxies generally record frequency-dependent climate signals. I would think that this frequency aspect is perhaps handled by careful selection of proxies or by e.g. choosing proper indexing methods if tree-rings are concerned. Do any of the approaches called climate field reconstruction (CFR methodologies) have clear advantages in this respect? Opinions, views and relevant references welcome!
Please look at the attached figure (Heiko Palike et al., 2012, nature). At ~34 Ma, we can find the CCD deepening, carbonate accumulation, pCO2 decreasing, ice-sheet expansion, and Antarcitic cooling. Mybe the trigger was ice-sheet expansion induced by low insolation. If the decrease of the pCO2 was uptaked by ocean, will be not good for carbonate accumulation. Isn't that a bit of a contradiction? How about the relationship between these variations? Thank you very much!
I need more information for paleoclimatic reconstruction. The shells were found in Holocene sediments from central-western Argentina
I use marine sediments to find out drought during the Holocene in the Eastern Arabian Sea. What are the data useful to support my objective?
Is it possible to demonstrate seasonality changes in the climates using non-laminated sediment cores? If so, which climate proxies are suitable for this purpose?
S. Davis, me, et al 2014 AGU abstract proposed that a 400 km-long, 50 km-wide pre-30 Ma buried erosional and rift trough in Ross Sea could have last been eroded by ice, and this ice could have been from the earliest (33 Ma) East and/or West Antarctic Ice sheet. This was very controversial among our co-authors, and we allowed other possibilities, such as River erosion after rifting ceased, assuming restoring differential subsidence removes the huge reverse gradients of the major unconformity along the trough axes.
Related to this:
Question 1: Is large (Piedmont) glacial or ice stream erosion like River erosion, where the ice can cut down on the order of 1 km in 1 or 2 million years if out of equilibrium in one direction (while the bed would instead aggrade if out of equilibrium in the other direction. I know that cold-based ice streams/glaciers are frozen to their beds and do not erode.
Question 2: Do you know of examples of 50 km-wide and >500 m deep troughs known to be deeply eroded by ice in a couple of million years or less? I’m thinking Northern Hemisphere like Greenland, because ice had not been there for tens of millions of years. Laurentian Trough on the shelf of Atlantic Canada may be one example, but I have not been able to find papers or seismic reflection data that show the base of the sub-bottom trough (we have figures of the sea floor trough, which is 50 km-wide but only a couple of hundred meters deep.
I am being a bit lazy; I have an abstract deadline on this in a week and just have not had time to focus on looking into the literature because I have had to spend my time on the Ross Sea interpretation and other projects.
(Davis et al is a student abstract; is my project).
As mirabilite is formed at the sea ice surface during the winter, there is a depletion in the ratio Sulfate/Sodium in the aerosols that deposit on an ice core site. Can we use the summer peaks of this ratio to identify annual layers or is it not reliable?
Does anyone know where I can find quantitative values for the percentages of septa, theca, costa, Exodissepiment, and Endodissepiment architectural structures in various corals (or just Montastraea) Thank you very much. John Paul Jones
I need European maps for the Cenozoic that can be used in GIS to plot fossil data.
Papers, references, databases? Quaternary deposits of Beringia region (from Taymir to Alaska) are interest for me....
There are a lot of literatures suggest that the westerlies could take precipitation into the central Tibetan Plateau and far more eastern areas during the cold period. Do anyone give some evidence?
I want to plot global sea level changes for the past 140,000 to determine trends in marine taxa radiations in the oceans. I have been unable to find data sets from NOAA.
How can I estimate paleotemperatures based on oxygen isotopes of dolomite cement? Could someone point me to a good reference?
High resolution dating of events in the Black and Marmara Seas during non-marine phases requires appropriate correction of C-14 ages because shells are not in equilibrium with global values of ca. 400 yr. Proposed values range from 0 (fully mixed, in equilibrium with atmosphere, no correction needed) to 1000 yrs (benthos contain old bottom water or river transported carbon). Peat (grows in equilbrium with atmosphere) compared to in-situ shell from the same sample indicates a reservoir correction of ca. 850 yrs is needed for shells. Which correction value is correct for A) Black Sea? B) Marmara Sea with overflow water.
I infer that there probably existed a passage between the Tibetan Plateau and the Qinling Mountains during the Late Miocene based a lot of tectonic and climatic records. Development of the passage was mainly controlled by the eastward expansion of the Tibetan Plateau, which constrained rainfall transported by the Asian summer monsoon to flow into interior China. I need a modeler help me to test this hypothesis? Please contact me for specific information
Distinguished Colleague, am working on the ECOLOGICAL FUNCTIONING OF ZOO AND PHYTOPLANKTON COMMUNITIES ACROSS THE PALEOCENE-EOCENE HYPER THERMAL EVENTS. Can anyone suggest how this can add value to petroleum exploration and production?
Simply, I’m looking for papers that gives me knowledge about any models or assumption concerning the thickness of troposphere of Early Atmosphere, e.i. during the Neo-, Meso- and PaleoProterozoic?
Thanks in advance, Zbyszek
The picture was taken from a piece of core in the late Triassic Ordos basin. Could any Palaeobotanist please help me to identify the ancient plants and list its implications for paleoclimate : in the late Triassic Ordos Basin, central China. It deposited in deltaic or lacustrine environment. I want to know its Latin name and implications for paleoclimate. Thanks a lot!
It is about stable isotope geochemistry
Does anyone know of detailed geologic maps of India? Thanks in advance...
I am interested in understanding the solar irradiance of Tropics during Bølling-Allerød period. I am not able to get the data/curve for the said period.
I'm a current masters student and wanted to see if people are aware of knowledge gaps in ENSO activity in South America and/or palaeoclimatology reconstruction needed. I've looked in a lot of literature and seems to be a lot of modelling for ENSO activity not actual proxy evidence, is this true?
I'm trying to reconstruct the productivity changes in the southeastern Arabian Sea, during the last glacial period. The foraminiferal proxies suggest an increased glacial productivity in this region. I want to understand the physical forcing, responsible for high surface primary productivity in this region during the last glacial period.
I am wondering if mangrove environments have ever been considered in global carbonate budget calculations? How are these systems affected by climate/drainage change?
Can somebody tell me the proper site for speleothem sampling?
I am little bit confused whether is taken from the location where it is equilibrium with external atmosphere or deep from the cave where humidity is near about 100. Some one told me the sample collected near from the cave entrance are most significant for the climatic study because it records the diurnal variation of the atmosphere. but here the kinetic fractionation also goverened the precipitation process please tell me the exact things.