Influence of the height of Antarctic ice sheet on its climate

Tewari, Kamal; Mishra, Saroj K.; Dewan, Anupam; Dogra, Gaurav; Ozawa, Hisashi

doi:10.1016/j.polar.2021.100642

Cited by 8 publications

(8 citation statements)

References 64 publications

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“…These simulations are performed using the Community Earth System Model version 1.0 (CESM 1.0), a coupled global climate model developed at National Center for Atmospheric Research (NCAR), and run under the pre‐industrial forcing. Previous studies carried out with CESM have demonstrated the advanced capability of the model for studying the South Asian monsoon (Anand et al ., 2018) and the climate of Antarctica (Lenaerts et al ., 2016; Tewari et al ., 2021a), relative to other Coupled Model Intercomparison Project phase 5 (CMIP5) models. These studies found that the CESM model is relatively well able to simulate the present‐day climate, precipitation and large‐scale atmospheric circulation, over both regions.…”

Section: Methodsmentioning

confidence: 99%

“…Thus, the Antarctic landmass has been subjected to frequent orographic perturbations in the past and will continue to fluctuate in the future. Several studies (Ogura and Abe‐Ouchi, 2001; Singh et al ., 2016; Tewari et al ., 2021a; 2021b) have therefore been conducted to investigate the consequences of orographic fluctuations and the associated changes on the atmosphere due to large‐scale Antarctic melting. These studies performed by changing the Antarctic orography have mostly focused on the annual global climatic changes, revealing that orographic changes over Antarctica have follow‐on effects that extend globally.…”

Section: Introductionmentioning

confidence: 99%

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Impact of the Antarctic topography on meridional energy transport and its consequential effect in the monsoon circulation

Tewari

Mishra

Fasullo

et al. 2021

Quart J Royal Meteoro Soc

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Antarctica has been losing ice in the past, and its ice loss is projected to further enhance in the future due to global warming, causing orographic changes over the region. Such orographic changes are likely to profoundly influence the global climate systems through energy transport over the Southern Hemisphere. The South Asian monsoon system, an anomalous climate system (a transient eddy regionally occurring rigorously during JJAS) originating in the Southern Hemisphere and transporting anomalous energy towards higher latitudes, is also expected to get influenced by its orography. A coupled global climate modelling framework is therefore used in this study to investigate the potential influence of the Antarctic orography on the South Asian monsoon system. The investigation reveals that a reduction in the Antarctic elevation would cause warming over the continent, which will cause changes in the energy budget, with more outgoing long‐wave radiation over Antarctica due to a warmer surface and moist atmosphere aloft. The global climate responds to this perturbation by enhancing the southward energy transport primarily by the atmospheric component via changes in mean flow and eddies from the equatorial region all the way to the South Pole. The monsoon system supports this southward energy transport demand in the Southern Hemisphere by strengthening the mean meridional circulation in the three cells over the Indian Ocean sector. Due to this, the low‐level cross‐equatorial flow enhances over the south equatorial Indian Ocean, which increases the evaporation, and causes changes in precipitation and stationary wave patterns. The sea‐level pressure and surface temperature changes adjust accordingly in response to changes in the circulation. However, rainfall and circulation over the Asian landmass do not change much as the southward energy transport is very much less and is mostly supported by the oceanic components and changes in latent energy over these latitudes.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Impact of the Antarctic topography on meridional energy transport and its consequential effect in the monsoon circulation

Tewari

Mishra

Fasullo

et al. 2021

Quart J Royal Meteoro Soc

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“…It accounts for almost 70 % of the world's freshwater, representing a potential sea level rise of 56.6 m (Shum et al, 2008). Its evolution has received considerable attention in climate research, as it determines the surface mass balance that has a major impact on both regional and global climate (DeConto et al, 2007;Bintanja et al, 2013;Goldner et al, 2014;Colleoni et al, 2018;Golledge et al, 2019;Tewari et al, 2021a). The size of the present-day AIS is known to impinge substantially on synoptic-and planetary-scale atmospheric flow (Parish and Bromwich, 2007;Schmittner et al, 2011;Hakuba et al, 2012;Goldner et al, 2013;Grazioli et al, 2017), and in turn, the warming-induced topographic changes of the AIS have a significant influence on the climate (Orr et al, 2008;Tewari et al, 2021a, b).…”

Section: Introductionmentioning

confidence: 99%

How changing the height of the Antarctic ice sheet affects global climate: a mid-Pliocene case study

et al. 2023

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Abstract. Warming-induced topographic changes of the East Antarctic ice sheet (EAIS) during the Pliocene warm period could have a significant influence on the climate. However, how large changes in the EAIS height could theoretically affect global climate have yet to be studied. Here, the influence of possible height changes of the EAIS on climate over the East Antarctic ice sheet region versus the rest of the globe is investigated through numerical climate modeling using the Pliocene as a test case. As expected, the investigation reveals that the reduction of ice sheet height leads to a warmer and wetter East Antarctica. However, unintuitively, both the surface air temperature and the sea surface temperature decrease over the rest of the globe. These temperature changes result from the higher air pressure over Antarctica and the corresponding lower air pressure over extra-Antarctic regions with the reduction of EAIS height. This topography effect is further confirmed by energy balance analyses. These findings could provide insights into future climate change caused by warming-induced height reduction of the Antarctic ice sheet.

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“…Although the Antarctic landmass is geographically isolated from the rest of the world, it profoundly influences the earth's climate system (Parish et al 1994). The vast ice sheet of the continent controls the earth's energy balance, regulates the hydrological cycle, and affects the atmospheric and oceanic circulations in the Southern Hemisphere (Singh et al 2016, Tewari et al 2021a, 2021b, 2021c. As the world's biggest freshwater reservoir, with a sea-level equivalent of 57.9 ± 0.9 m (Morlighem et al 2020), the mass of its constantly changing ice sheet is directly related to increasing sea levels.…”

Section: Introductionmentioning

confidence: 99%

“…However, studies also indicate that the enhanced precipitation due to the climatic changes will partially offset this sea-level rise (Frieler et al 2015, Favier et al 2017, Tewari et al 2021a. The precipitation enhancement would be a result of the thermodynamic and dynamic changes caused in response to the greenhouse emissions, among which the thermodynamic changes would dominate the response (Uotila et al 2007, Grieger et al 2016.…”

Section: Introductionmentioning

confidence: 99%

Future projections of temperature and precipitation for Antarctica

Tewari

Mishra

Salunke

et al. 2022

Environ. Res. Lett.

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Antarctica directly impacts the lives of more than half of the world’s population living in the coastal regions. Therefore it is highly desirable to project its climate for the future. But it is a region where the climate models have large inter-modal variability and hence it raises questions about the robustness of the projections available. Therefore, we have examined 87 global models from three modeling consortia (CMIP5, CMIP6, and NEX-GDDP), characterized their fidelity, selected a set of 10 models (MM10) performing satisfactorily, and used them to make the future projection of precipitation and temperature, and assessed the contribution of precipitation towards sea-levels. For the historical period, the multi-model mean (MMM) of CMIP5 performed slightly better than CMIP6 and was worse for NEX-GDDP, with negligible surface temperature bias of approximately 0.5°C and a 17.5% and 19% biases in the mean precipitation noted in both CMIP consortia. These biases considerably reduced in MM10, with 21st century projections showing surface warming of approximately 5.1 - 5.3°C and precipitation increase approximately 44 - 50% against ERA-5 under high-emission scenarios in both CMIP consortia. This projected precipitation increase is much less than that projected using MMM in previous studies with almost the same level of warming, implying approximately 40.0 mm/year contribution of precipitation towards sea-level mitigation against approximately 65.0 mm/year.

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Influence of the height of Antarctic ice sheet on its climate

Cited by 8 publications

References 64 publications

Impact of the Antarctic topography on meridional energy transport and its consequential effect in the monsoon circulation

Impact of the Antarctic topography on meridional energy transport and its consequential effect in the monsoon circulation

How changing the height of the Antarctic ice sheet affects global climate: a mid-Pliocene case study

Future projections of temperature and precipitation for Antarctica

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