Geophysical Research Letters (GEOPHYS RES LETT )

Publisher: American Geophysical Union, American Geophysical Union


Geophysical Research Letters publishes short, concise research letters that present scientific advances that are likely to have immediate influence on the research of other investigators. GRL letters can focus on a specific discipline or apply broadly to the geophysical science community.

Impact factor 4.46

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  • Website
    Geophysical Research Letters website
  • Other titles
    Geophysical research letters
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  • Material type
    Periodical, Internet resource
  • Document type
    Journal / Magazine / Newspaper, Internet Resource

Publisher details

American Geophysical Union

  • Pre-print
    • Author can archive a pre-print version
  • Post-print
    • Author can archive a post-print version
  • Conditions
    • Authors' Pre-print on Authors own or departmental website
    • Authors' Post-print on Authors own or departmental website
    • Set statements to accompany pre-print, submitted, accepted and published articles
    • Publisher copyright and source must be acknowledged with DOI
    • Publisher's version/PDF must be used in Institutional Repository 6 months after publication.
  • Classification
    ​ green

Publications in this journal

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    ABSTRACT: 1] For Fe contained in long-range transported aeolian dust to act as a micronutrient for oceanic phytoplankton it must be first dissolved or mobilized. We propose that Fe-mobilization can occur in mineral dust from East Asia by the incorporation of SO 2 into the advecting dust plumes and subsequent acidification of the dust through heterogeneous SO 2 oxidation. To test this hypothesis, we consider a dust plume that originated from the gobi-deserts and advected over the Pacific Ocean. Data collected over the Yellow Sea confirm that this plume contained high concentrations of dust and SO 2 . Significant gaseous HNO 3 concentrations indicate that the dust particles were acidified (i.e., pH < 2). At these pH's, 1– 2% of the Fe contained in a deliquescent mineral dust particle would be mobilized within 3 –5 days. These results suggest a possible link between the rate of C-fixation in so-called High-Nitrate-Low-Chlorophyll regions of the Pacific Ocean and SO 2 emissions from East Asia.
    Geophysical Research Letters 01/2085; 30.
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    ABSTRACT: 1] Precipitation data from the new ERA40 reanalyses and from a 200-year simulation confirm a robust main mode of precipitation variability in west Antarctica. An intermittently strong ENSO signature is found in this mode. However, high correlation with ENSO indices appears infrequent. Thus, the high correlation found in ERA40, and previously in other chronologically realistic data, in the late 1980s and the 1990s may not be expected to last. Unlike previously suggested by others, the sign of the correlation between ENSO indices and west Antarctic precipitation, when significant, does not appear to change in time: Precipitation variability at the ENSO pace in the Bellingshausen-Weddell (Ross-Amunsden) region is consistently in phase (phase opposition, respectively) with the Southern Oscillation Index. This is consistent with a tropospheric wave train connecting the tropical Pacific and west Antarctic regions, which modulates in phase opposition the advection of air and moisture in the 2 regions.
    Geophysical Research Letters 01/2081; 30.
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    ABSTRACT: 1] The high-resolution wind vectors observed by the space-based scatterometer QuikSCAT, from 1999 to 2002, show that the double intertropical convergence zones (ITCZ) exist in the Atlantic and the eastern Pacific oceans for most of the annual cycle, and are far more extensive than previously recognized. For most of the time, the southern ITCZ is weaker than the northern one. The stronger ITCZ occurs when the northerly trade winds meet the southerly trade winds over warm water, resulting in deep convection. The weaker ITCZ over cooler water is caused by the deceleration of the surface winds as they approach the cold upwelling water near the equator. Decreases in vertical mixing and increases in vertical wind shear in the atmospheric boundary layer are suggested to be the causes of the deceleration of the trade winds as they move from warmer to colder water.
    Geophysical Research Letters 01/2072; 29.
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    ABSTRACT: 1] The environmental damage caused by atmospheric pollutants is proportional to the duration of their effects. The global impacts of greenhouse gases (as measured by global warming potential) and ozone depleting substances (as measured by ozone depletion potential) have traditionally been calculated using the atmospheric lifetime of the source gas as a quantitative measure of the impact's duration, assuming that the gas quickly reaches a steady-state pattern which decays exponentially according to the lifetime. This assumed behavior obviously does not match the true rise and fall of impacts, particularly secondary ones like ozone depletion, that can be seen in numerical integrations or chemical mode decomposition. Here, the modes decomposition is used to prove that: (a) the steady-state pattern of impacts caused by specified emissions, multiplied by (b) the steady-state lifetime of the source gas for that emission pattern, is exactly equal to (c) the integral of all impacts -independent of the number and atmospheric residence times of secondary impacts.
    Geophysical Research Letters 01/2063; 29.
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    ABSTRACT: 1] In the interior western United States, increased demand for water coupled with the uncertain nature of anthropogenic and natural hydroclimatic variations add challenges to the task of assessing the adequacy of the existing regional water resources systems. Current availability of relatively short instrumental streamflow records further limits the diagnosis of multidecadal and longer time variations. Here we develop a long-term perspective of streamflow variations using a 285-year long tree-ring reconstruction at Middle Boulder Creek, Colorado. Analysis of the reconstructed streamflow provides useful insights for assessing vulnerability: (a) a wider range of hydrologic variations on multidecadal time scales, not seen in the instrumental record, (b) wet/dry regimes show disparate fluctuations across various flow thresholds, and (c) temporal changes in the flow probabilities have varied ''flavors'' corresponding to wet and dry regimes and their spatial extent. Based on these results, we discuss implications for the climate-related vulnerability of regional water resources.
    Geophysical Research Letters 01/2036; 29.
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    ABSTRACT: Pronounced inter-model differences in the projected response of land surface precipitation (LSP) to future anthropogenic forcing remain in the Coupled Model Intercomparison Project Phase 5 (CMIP5) model integrations. A large fraction of the inter-model spread in projected LSP trends is demonstrated here to be associated with systematic differences in simulated sea surface temperature (SST) trends, especially the representation of changes in: i) the interhemispheric SST gradient; and ii) the tropical Pacific SSTs. By contrast, inter-model differences in global-mean SST, representative of differing global climate sensitivities, exert limited systematic influence on LSP patterns. These results highlight the importance to regional terrestrial precipitation changes of properly simulating the spatial distribution of large-scale, remote changes as reflected in the SST response to increasing greenhouse gases. Moreover, they provide guidance regarding which region-specific precipitation projections may be potentially better constrained for use in climate change impact assessments.
    Geophysical Research Letters 01/2015;
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    ABSTRACT: The superrotation of the atmospheres of slowly rotating bodies is a longstanding problem yet unsolved in atmospheric dynamics. On Venus, the most extreme case known of superrotation, this is accompanied and influenced by a recurrent planetary-scale cloud structure, known as the Y-feature. So far, no model has simultaneously reproduced its shape, temporal evolution, related wind field, nor the relation between its dynamics and the unknown UVabsorbing aerosol that produces its dark morphology. In this paper we present an analytical model for a Kelvin-like wave that offers an explanation of these peculiarities. Under Venus cyclostrophic conditions, this wave is equatorially and vertically trapped where zonal winds peak, extends 7 km in altitude, and its vertical wind perturbations are shown to produce upwelling of the UV absorber. The Y-feature morphology and its 30-day evolution are reproduced as distortions of the wave structure by the Venus winds.
    Geophysical Research Letters 01/2015; 42:1-7.