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Title: Synoptic Drivers of Atmospheric River Induced Precipitation Near Dronning Maud Land, Antarctica

Journal Article · · Journal of Geophysical Research. Atmospheres

Atmospheric rivers (ARs) that reach the Antarctic Ice Sheet (AIS) transport anomalous moisture from lower latitudes and can impact the AIS via extreme precipitation and increased downward longwave radiation. ARs contribute significantly to the interannual variability of precipitation over the AIS and thus are likely to play a key role in understanding future changes in the surface mass balance of the AIS. Dronning Maud Land (DML) is one of four maxima in AR frequency over coastal East Antarctica, with AR precipitation explaining 77% of the interannual variability in precipitation for this region. We employ a 16-node self-organizing map (SOM) trained with MERRA-2 sea-level pressure anomalies to identify synoptic-scale environments associated with landfalling ARs in and around DML. Node composites of atmospheric variables reveal common drivers of precipitation associated with ARs reaching DML including anomalous high-low surface pressure couplets, anomalously high integrated water vapor, and coastal barrier jets. Using a quasi-geostrophic framework, we find that upward vertical motion associated with the occlusion process of attendant cyclones dominates atmospheric lift in AR environments. We further identify mechanisms that explain the variability in AR precipitation intensity across nodes, such as the lift associated with the occlusion process of attendant cyclones and the spatial coincidence of ascent induced by the occlusion process and frontogenesis. Here, the latter suggests that ARs making landfall during the mature phase of cyclogenesis result in higher precipitation intensity compared to landfalling ARs that occur during the occluded phase.

Research Organization:
University Corporation for Atmospheric Research (UCAR), Boulder, CO (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER)
Grant/Contract Number:
SC0022070
OSTI ID:
1970355
Alternate ID(s):
OSTI ID: 1972740
Journal Information:
Journal of Geophysical Research. Atmospheres, Journal Name: Journal of Geophysical Research. Atmospheres Journal Issue: 7 Vol. 128; ISSN 2169-897X
Publisher:
American Geophysical UnionCopyright Statement
Country of Publication:
United States
Language:
English

References (51)

On the use of self‐organizing maps for studying climate extremes journal April 2017
Atmospheric River Impacts on Greenland Ice Sheet Surface Mass Balance journal August 2018
Observing and Modeling Ice Sheet Surface Mass Balance journal June 2019
Recent snowfall anomalies in Dronning Maud Land, East Antarctica, in a historical and future climate perspective: EAST ANTARCTIC SNOWFALL ANOMALIES journal June 2013
The Diagnosis of Synoptic-Scale Vertical Motion in an Operational Environment journal March 1987
Quasigeostrophic Diagnosis of Cyclogenesis Associated with a Cutoff Extratropical Cyclone-The Christmas 1987 Storm journal June 1993
Relative Performance of Self-Organizing Maps and Principal Component Analysis in Pattern Extraction from Synthetic Climatological Data journal July 2005
A new, high-resolution surface mass balance map of Antarctica (1979-2010) based on regional atmospheric climate modeling: SMB ANTARCTICA journal February 2012
The Key Role of Diabatic Outflow in Amplifying the Midlatitude Flow: A Representative Case Study of Weather Systems Surrounding Western North Pacific Extratropical Transition journal October 2016
Atmospheric Triggers of the Brunt Ice Shelf Calving in February 2021 journal May 2022
Synoptic diagnosis of frontogenetic and cyclogenetic processes journal January 1992
Meteorological Characteristics and Overland Precipitation Impacts of Atmospheric Rivers Affecting the West Coast of North America Based on Eight Years of SSM/I Satellite Observations journal February 2008
Intense atmospheric rivers can weaken ice shelf stability at the Antarctic Peninsula journal April 2022
Orographic Flow Influence on Precipitation During an Atmospheric River Event at Davis, Antarctica journal January 2022
A new look at the ω-equation journal January 1978
Landfalling Atmospheric Rivers, the Sierra Barrier Jet, and Extreme Daily Precipitation in Northern California’s Upper Sacramento River Watershed journal July 2016
The Dominant Role of Extreme Precipitation Events in Antarctic Snowfall Variability journal March 2019
Links between Large-Scale Modes of Climate Variability and Synoptic Weather Patterns in the Southern Indian Ocean journal February 2021
Self-organizing map analysis of widespread temperature extremes in Alaska and Canada journal February 2015
Comparison of self-organizing maps classification approach with cluster and principal components analysis for large environmental data sets journal November 2007
The key role of diabatic processes in modifying the upper-tropospheric wave guide: a North Atlantic case-study
  • Grams, Christian M.; Wernli, Heini; Böttcher, Maxi
  • Quarterly Journal of the Royal Meteorological Society, Vol. 137, Issue 661 https://doi.org/10.1002/qj.891
journal August 2011
The role of atmospheric rivers in anomalous snow accumulation in East Antarctica journal September 2014
Investigations into Synoptic Spatiotemporal Characteristics of Coastal Upper Ocean Circulation Using High Frequency Radar Data and Model Output journal September 2020
MERRA-2 inst1_2d_asm_Nx: 2d,3-Hourly,Instantaneous,Single-Level,Assimilation,Single-Level Diagnostics V5.12.4 dataset January 2015
The Development and Evolution of Two Atmospheric Rivers in Proximity to Western North Pacific Tropical Cyclones in October 2010 journal December 2013
Atmospheric River Precipitation Contributed to Rapid Increases in Surface Height of the West Antarctic Ice Sheet in 2019 journal March 2021
Increased snowfall over the Antarctic Ice Sheet mitigated twentieth-century sea-level rise journal December 2018
Atmospheric River Families: Definition and Associated Synoptic Conditions journal October 2019
MERRA-2 inst1_2d_asm_Nx: 2d,3-Hourly,Instantaneous,Single-Level,Assimilation,Single-Level Diagnostics V5.12.4 dataset January 2015
Orographic Clouds in Terrain-Blocked Flows: An Idealized Modeling Study journal November 2008
Flexible Self-Organizing Maps in kohonen 3.0 journal January 2018
A Nonlinear Mapping for Data Structure Analysis journal May 1969
Future Antarctic snow accumulation trend is dominated by atmospheric synoptic-scale events journal December 2020
Atmospheric signals and characteristics of accumulation in Dronning Maud Land, Antarctica journal August 1999
Quasigeostrophic Vertical Motions Diagnosed from Along- and Cross-isentrope Components of the Q Vector journal May 1992
Relationship Between Weather Regimes and Atmospheric Rivers in East Antarctica journal December 2021
MERRA-2 inst3_3d_asm_Np: 3d,3-Hourly,Instantaneous,Pressure-Level,Assimilation,Assimilated Meteorological Fields V5.12.4 dataset January 2015
Snowfall in high southern latitudes journal January 1988
The Modern-Era Retrospective Analysis for Research and Applications, Version 2 (MERRA-2) journal July 2017
Characterizing the influence of atmospheric river orientation and intensity on precipitation distributions over North Coastal California: ARs and Precipitation Over North Coastal CA journal September 2017
Flash Flood Forecasting: An Ingredients-Based Methodology journal December 1996
Kinematic and Thermodynamic Structures of Sierra Barrier Jets and Overrunning Atmospheric Rivers during a Landfalling Winter Storm in Northern California journal June 2013
Bedmap2: improved ice bed, surface and thickness datasets for Antarctica journal January 2013
A Scale to Characterize the Strength and Impacts of Atmospheric Rivers journal February 2019
Atmospheric Rivers Emerge as a Global Science and Applications Focus journal September 2017
MERRA-2 inst3_3d_asm_Np: 3d,3-Hourly,Instantaneous,Pressure-Level,Assimilation,Assimilated Meteorological Fields V5.12.4 dataset January 2015
West Antarctic surface melt triggered by atmospheric rivers journal October 2019
Antarctic Atmospheric River Climatology and Precipitation Impacts journal April 2021
July 2012 Greenland melt extent enhanced by low-level liquid clouds journal April 2013
Self-Organizing Maps book January 2001
Defining “Atmospheric River”: How the Glossary of Meteorology Helped Resolve a Debate journal April 2018