Jonathan Wille

Jonathan Wille
Université Grenoble Alpes · Institut des Géosciences de l'Environnement

PhD

About

23
Publications
3,730
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371
Citations
Introduction
Antarctic Meteorologist and Climatologist. Currently a Post-doc at the Université Grenoble Alpes. My research focuses on the role of atmospheric rivers and general poleward moisture transport on the Antarctic mass balance. I've spent multiple seasons in Antarctica for logistical support and scientific field work. Some of my adventures are here in my blog. https://frozenwille.wordpress.com/

Publications

Publications (23)
Article
Over the past two decades the primary driver of mass loss from the West Antarctic Ice Sheet (WAIS) has been warm ocean water underneath coastal ice shelves, not a warmer atmosphere. Yet, surface melt occurs sporadically over low-lying areas of the WAIS and is not fully understood. Here we report on an episode of extensive and prolonged surface melt...
Article
Accurately predicting moisture and stability in the Antarctic planetary boundary layer (PBL) is essential for low-cloud forecasts, especially when Antarctic forecasters often use relative humidity as a proxy for cloud cover. These forecasters typically rely on the Antarctic Mesoscale Prediction System (AMPS) Polar Weather Research and Forecasting (...
Article
Full-text available
Recent major melting events in West Antarctica have raised concerns about a potential hydrofracturing and ice shelf instability. These events often share common forcings of surface melt-like anomalous radiative fluxes, turbulent heat fluxes and föhn winds. Using an atmospheric river detection algorithm developed for Antarctica together with surface...
Article
Full-text available
The Antarctic Ice Sheet (AIS) is sensitive to short-term extreme meteorological events that can leave long-term impacts on the continent’s surface mass balance. We investigate the impacts of atmospheric rivers (ARs) on the AIS precipitation budget using an AR detection algorithm and a regional climate model (MAR) from 1980-2018. While ARs and their...
Article
Full-text available
The disintegration of the ice shelves along the Antarctic Peninsula have spurred much discussion on the various processes leading to their eventual dramatic collapse, but without a consensus on an atmospheric forcing that could connect these processes. Here, using an atmospheric river detection algorithm along with a regional climate model and sate...
Article
Full-text available
The Southern Hemisphere cryosphere has recently shown regionally-contrasted responses to climate change, in particular to the positive phases of the Southern Annular Mode. However, the understanding of the impacts of this mode on ice-shelf basal melt at a circum-Antarctic scale is still limited. Here, we performed idealized experiments with a pan-A...
Article
Full-text available
Sur une grande partie de l'Antarctique, le bilan de masse (c'est-à-dire de neige) de surface est dominé par quelques événements de précipitations extrêmes. Ces événements dépendent d'intrusions de masses d'air très humide associées à des phénomènes dénommés rivières atmosphériques en provenance de l'océan Austral. Ces rivières atmosphériques influe...
Conference Paper
Full-text available
The mass balance of Antarctica is sensitive to intrusions of extremely warm, moist airmasses from the mid-latitudes in the form of atmospheric rivers (ARs). These storms provide a subtropical link to the Antarctic continent and engender extreme atmospheric conditions that are largely consequential to surface melt, snowfall, and ice-shelf stability....
Article
Full-text available
Atmospheric rivers, or long but narrow regions of enhanced water vapor transport, are an important component of the hydrologic cycle as they are responsible for much of the poleward transport of water vapor and result in precipitation, sometimes extreme in intensity. Despite their importance, much uncertainty remains in the detection of atmospheric...
Article
Full-text available
Plain Language Summary The Antarctic continent contains 90 percent of the world's freshwater ice, so any significant melt has serious implications for sea level rise. To date, most ice loss has occurred when warm ocean currents melt coastal ice from below. However, the higher air temperatures predicted for the coming decades are expected to increas...
Article
Full-text available
Here, we define weather regimes in the East Antarctica — Southern Ocean sector based on daily anomalies of 700hPa geopotential height derived from ERA5 reanalysis during 1979-2018. Most regimes and their preferred transitions depict synoptic-scale disturbances propagating eastwards off the Antarctic coastline. While regime sequences are generally s...
Article
Full-text available
Paleoclimate archives, such as high-resolution ice core records, provide a means to investigate past climate variability. Until recently, the Law Dome (Dome Summit South site) ice core record remained one of few millennial-length high-resolution coastal records in East Antarctica. A new ice core drilled in 2017/2018 at Mount Brown South, approximat...
Preprint
Full-text available
The disintegration of the ice shelves along the Antarctic Peninsula have spurred much discussion on the various processes leading to their eventual dramatic collapse, but without a consensus on an atmospheric forcing that could connect these processes. Here, using an atmospheric river (AR) detection algorithm along with a regional climate model and...
Thesis
Full-text available
Due to the increased ability of the air to hold moisture with temperature, precipitation in Antarctica is expected to increase significantly over the next century. This process will undoubtedly lead to an increase in snow accumulation on the continent, thereby partially mitigating future sea level rise. However, recent observed trends in temperatur...
Article
Full-text available
Understanding the interannual variability of Surface Mass Balance (SMB) and surface melting in Antarctica is key to quantify the signal to noise ratio in climate trends, identify opportunities for multi-year climate predictions, and to assess the ability of climate models to respond to climate variability. Here we simulate summer SMB and surface me...
Article
Full-text available
Understanding the interannual variability of surface mass balance (SMB) and surface melting in Antarctica is key to quantify the signal-to-noise ratio in climate trends, identify opportunities for multi-year climate predictions and assess the ability of climate models to respond to climate variability. Here we simulate summer SMB and surface meltin...
Article
Full-text available
Plain Language Summary The Antarctic ice sheet is extremely important because of its possible contribution to sea level rise and through the climate records than can be reconstructed using chemical signals locked in the ice. The mass of the ice sheet is constantly changing because of the ice gained by snowfall and the loss of ice at the margins via...
Data
Supplementary Figures, Supplementary Tables and Supplementary References
Article
Accurate representation of the stability of the surface layer in numerical weather prediction models is important because of the impact it has on forecasts of surface energy, moisture, and momentum fluxes. It also impacts boundary layer processes such as the generation of turbulence, the creation of near-surface flows, and fog formation. This paper...
Article
Full-text available
Flight operations in Antarctica rely on accurate weather forecasts aided by the numerical predictions primarily produced by the Antarctic Mesoscale Prediction System (AMPS) that employs the polar version of the Weather Research and Forecasting (Polar WRF) Model. To improve the performance of the model's Mellor-Yamada-Janjic (MYJ) planetary boundary...

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Project (1)
Project
https://app.dimensions.ai/details/grant/grant.9664661