Peter Escher

Peter Escher

Dr. rer. nat.

About

44
Publications
4,930
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608
Citations

Publications

Publications (44)
Conference Paper
Submarine Groundwater Discharge (SGD) may act as a source of fresh water and dissolved substances for coastal ecosystems, and its fluxes may strongly depend on the benthic water-solid-microbe interactions close to the sediment-water interface. The present study addresses the impact of near-shore SGD on the biogeochemical process at the sediment-wat...
Article
The depositional environment in the subtropical Beibu Gulf area is highly complex, and the sediments accumulate under specific combinations of hydrodynamics, physiography and sediment sources. In the present study, six sedimentary gravity cores were collected from three different depositional zones of the Beibu Gulf. We measured the geochemical and...
Article
Evidence from experimental grasslands indicated that plant biodiversity modifies the water cycle but it is unclear if this is also true for established land-use systems. Therefore, we investigated how evapotranspiration (ETa), downward flux (DF), and upward flux (UF) in soil are related with land use and plant diversity in agriculturally managed gr...
Article
Carbonates formed from hyperalkaline aqueous solutions at the Earth's surface are known to bear the most extreme disequilibrium isotope signatures reported so far in nature. We present here the results for stable carbon (C), oxygen (O), and barium (Ba) isotope fractionation during the precipitation of witherite (BaCO3) induced by the chemical absor...
Article
Full-text available
We report first results from a study on water and element exchange across the land-ocean boundary at the southern Baltic Sea. The focus is set on ferruginous fresh ground waters escaping at the shore line, flowing in air contact before entering a subterranean mixing zone with brackish Baltic Sea water. The present study combines the results from mu...
Conference Paper
Submarine ground water discharge (SGD) into coastal ecosystems is perceived as an important source of fresh water and solutes (nutrients, metabolites, trace elements) in marine biogeochemical cycles. Less is known about its significance for the German coastal zone. We present here the results of hydrogeochemical and stable isotope geochemical studi...
Conference Paper
Full-text available
The hydro- and stable isotope biogevhemistry of anoxic spring waters emerging at the southern Baltic Sea fresh waters were investigated on a seasonal base. Irin precipitates and the role for the adsorption of elements like dissolved phosphate were characterized geochemically and the presence of iron oxidizers was confirmed. The DIC-rich springs pro...
Data
Here, the pelagic carbonate system and the ?13C signature of dissolved inorganic carbonate (DIC) were investigated in a tidal basin of the southern North Sea, the Jade Bay, with respect to tidal cycles and a transect towards the North Sea in winter time (January and November, 2010). Physical parameters, major and trace elements, and nutrient concen...
Chapter
Full-text available
We report first results from a study conducted in different tidal basins of the southern North Sea, here with a focus on the Jade Bay and the backbarrier tidal area of Spiekeroog Island. The present study combines the results from several seasonal sampling campaigns that investigated the tidal response of the pelagic carbonate system under differen...
Article
Full-text available
Due to increased pollution by nitrate from intensive agricultural and other anthropogenic activities the Marano lagoon (northeast Italy) and part of its catchment area have been investigated, applying a combined approach of hydrochemical and isotopic techniques. Thus, to identify and characterize the potential multiple-sources of nitrate pollution...
Article
The 250–300-m-thick Carajás Formation in the Carajásmineral province, northern Brazil, consists of banded iron formation (including giant high-grade iron-ore deposits) and minor black shale, overlying a thick pile (2–3 km) of about 2.75-Ga-old metabasalt. Carbonaceous shale with pyrite- and locally pyrrhotite-rich patches from drillcore of the Serr...
Article
A multi-isotope approach has been used in the Marano lagoon (NE Italy) and parts of its catchment area to identify causes of increased pollution. The hydrogeochemical features of different water types and potential sources of were characterized using the isotopic composition of (δ15N, δ18O, and Δ17O) and other source-related species such as B (δ11B...
Article
The depositional environment of the Beibu Gulf is highly complex, and sediments are formed under dynamic changes in hydrodynamics and sediment sources. It is an ideal natural laboratory to study biogeochemical transformation processes and its responses to changes in hydrography and depositional conditions in a tropical shelf environment. In the pre...
Article
Here, the pelagic carbonate systemand the δ13C signature of dissolved inorganic carbonate (DIC)were investigated in a tidal basin of the southern North Sea, the Jade Bay, with respect to tidal cycles and a transect towards the North Sea inwinter time (January and November, 2010). Physical parameters,major and trace elements, and nutrient concentrat...
Article
Full-text available
The early diagenesis of sulfur was assessed in four short sediment cores on the continentalshelf off southeastern Brazil that were deposited under the influence of an upwelling tropicalsystem. This tropical upwelling area allows a direct focus on the coupled roles of hydrody-namic- and bioturbation-driven influences on sulfate reduction, sulfide re-ox...
Article
The Precambrian/Cambrian boundary marks a critical interval in Earth history. Paleoenvironmental changes of the oceans have been suggested as a possible explanation for some significant events such as the marine biological evolution (“Cambrian explosion”). Here we report a remarkable variation range in trace element, iron speciation and molybdenum...
Article
Little is known about biogeochemical carbon-sulfur(-metal) cycling in organic matter- and/or iron-limited tidal coastal environments and the formation of corresponding sedimentary geochemical signatures. In the present study, we analyzed two 20 m-long cores that were recovered from the tidal backbarrier area of Spiekeroog Island, NW Germany. The dr...
Article
The isotopic composition of nitrate (δ15N, δ18O and Δ17O), boron (δ11B) and water (δ2H and δ18O) were used to identify and characterize of multiple nitrate pollution sources in the Marano Lagoon (Italy) and part of its catchment area. The stable isotopes in nitrate measured by the denitrifier method have been adopted to differentiate among nitrate...
Article
Full-text available
Processes in the carbonate system of surface waters are in particular sensitive to variations of boundary conditions as, for instance, the partial pressure of carbon dioxide in the atmosphere and the aqueous solution. Examples range from streams, rivers, to coastal marine waters. The flux of carbon dioxide from continental flowing waters was recent...
Article
Full-text available
The formation of secondary sulphate minerals such as thaumasite, ettringite and gypsum is a process causing severe damage to concrete constructions. A major key to understand the complex reactions, involving concrete deterioration is to decipher the cause of its appearance, including the sources of the involved elements. In the present study, sulph...
Conference Paper
Full-text available
The Beibu Gulf forms the transition zone between the highly economic and agricultural coastal areas of South China and North Vietnam and the South China Sea. The coastal area is influenced by pronounced natural and anthropogenic forces which may strongly influence matter fluxes to the Beibu basin. Results from a joint German-Chinese expedition in t...
Conference Paper
Spatial gradients and temporal variations of the dissolved inorganic carbonate system are investigated in tidal areas of the North Sea to understand the impact of benthic processes on the production of alkalinity and its subsequent export to the open North Sea. In areas of complex mixing DI13C is of particular use to identifiy sources, sinks and bi...
Article
Measurements of dependence of photosynthetic electron transport on irradiance and analyses of stable isotope ratios (δ18O, δ13C, δ15N) were performed on 4 to 6-year-old pine trees (Pinus sylvestris L.) in the primeval forest reserve of Białowieża and on 21-year-old pine trees of a plantation of different provenances at the Sękocin Forest Station ne...
Article
Full-text available
Detection and characterisation of potential nitrate pollution sources in the Marano Lagoon and set-up of an environmental monitoring plan – FONIMAR project – Part II. The aims of this study were mainly: (i) the identification and differentiation of the main anthropogenic nitrogen sources in the Marano Lagoon (Italy) and its catchment area; and (ii)...
Article
Leaves of the mistletoe Viscum album (L.) show a high rate of transpiration, even when the host is under severe drought stress. The hypothesis that a strong control of ABA influx from the xylem sap of the host into the mistletoe prevents stomatal closure in mistletoe leaves was tested under the following conditions: sections of poplar twigs carryin...
Article
The flux of glutamine into the mistletoe Viscum album from the xylem sap of a coniferous host was analyzed. For this purpose, a perfusion system was used in which the xylem sap of the host was replaced by an artificial perfusion solution. With this system, flux rates into the mistletoe were determined in feeding experiments with the organic nitroge...
Article
Under the site conditions of a temperate forest, the exchange of short-chained oxygenated carbonyls (aldehydes, ketones) was assessed from leaves of adult European beech trees. The crowns of the trees were either exposed to an elevated O3 regime as released by a free-air fumigation system (2 × O3) or to the unchanged O3 regime at the site (1 × O3,...
Article
The flux of inorganic and organic nitrogen into the mistletoe Viscum album L. from the xylem sap of a deciduous (Populus x euamericana) and a coniferous host (Abies alba Mill.) was analyzed. For this purpose, a perfusion system was developed in which the xylem sap of the host was replaced by an artificial perfusion solution. With this system flux r...
Article
Full-text available
In a field study, the composition and concentrations of amino compounds in the xylem sap of the mistletoe, Viscum album L., and in the xylem sap of two host species, an evergreen conifer (Abies alba Mill.) and a deciduous broad-leaved tree (Populus x euramericana), were analyzed. The xylem sap of both hosts and mistletoe contained large, but simila...
Article
In the present field study we analysed the seasonal pattern of carbohydrate composition and contents in the xylem sap of Viscum album and the xylem sap of a deciduous (Populusxeuramericana) and a coniferous (Abies alba) host tree species. The results were compared with the soluble carbohydrate composition and contents of mistletoe tissues. On both...
Article
Ziel der vorliegenden Arbeit war es, die Akquisition von Kohlenstoff, Stickstoff und Schwefel bei Viscum album aus dem Wirtsxylem eingehender zu untersuchen. Hierzu wurden die räumlichen und zeitlichen Muster wichtiger Substanzgruppen (Kohlenhydrate, reduzierte Schwefelverbindungen, Aminoverbindungen) in Viscum album auf dem sommergrünen Wirt Popul...
Article
In the present field study with adult trees inhabited by Viscum album, the question was addressed as to whether European mistletoes are able to remove reduced sulphur from the xylem sap of its hosts. For this purpose the reduced sulphur composition and content of the xylem sap of Viscum album and the corresponding hosts Populus × euramericana and A...
Article
Porosity and pore-size-distribution are important characteristics of sediments. For describing these parameters in freshwater-sediments with coarse grain-sizes a new method has been developed to analyze undisturbed pores without destruction. Hyporheic sediments with natural sorting and arrangement had been obtained by core freezing. With x-ray-comp...
Article
Full-text available
Natürliches Flußsediment in 4 verschiedenen Korngrößen wurde in Röhren für 21-26 Wochen im hyporheischen Interstitial eines Riffles bei Ganterschwil im Unterlauf des Neckers exponiert. Von den insgesamt 28 Einzelproben wurden Respiration (nach der Methode PUSCH & SCHWOERBEL 1991), Abundanz der Biofilmbakterien, k-Wert und POM-Gehalt bestimmt. Mit e...

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Projects (6)