Association between Antarctic Sea ice, Pacific SST and the Indian summer monsoon: An observational study

Prabhu, Amita; Mandke, Sujata K.; Kripalani, R. H.; Pandithurai, G.

doi:10.1016/j.polar.2021.100746

Cited by 7 publications

(3 citation statements)

References 64 publications

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“…The Atlantic meridional overturning circulation is slowing down in response to the Arctic sea ice melt (Smeed et al., 2014) that may add more complexity to the teleconnection between the Atlantic SST and ISM. Earlier studies suggested a possible teleconnection between the Arctic and Antarctic sea ice variability and the Asian summer monsoon on intraseasonal and interannual scales (Chatterjee et al., 2021; Guo et al., 2014; Prabhu et al., 2012, 2021). The influence of tropical variability on the Arctic was also reported (Krishnamurti et al., 2015; Nuncio et al., 2020).…”

Section: Introductionmentioning

confidence: 99%

Weakening of Indian Summer Monsoon Synoptic Activity in Response to Polar Sea Ice Melt Induced by Albedo Reduction in a Climate Model

Chandra

Sandeep

Suhas

et al. 2022

Earth and Space Science

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The effect of polar sea ice melt on low latitude climate is little known. To understand the response of the Indian summer monsoon (ISM) synoptic activity to the sea ice melt, we have run a suite of coupled and uncoupled climate model simulations. In one set of simulations, the albedo of sea ice is reduced so that it would melt due to increased absorption of solar radiation. The coupled model simulation with a reduced sea ice albedo resulted in an almost complete melting of the sea ice in summer in both hemispheres. A high‐resolution (50 km) atmospheric general circulation model (AGCM) is forced with the climatological annual cycles of sea surface temperature (SST) and sea ice concentrations (SIC) from the coupled model outputs to better resolve synoptic scale variability. In the high‐resolution AGCM simulations forced with SST and SIC from the sea ice melt experiments, the ISM circulation weakened substantially, and the monsoon low‐pressure systems (LPS) activity experienced an overall decline of 23%, with a widespread weakening in the south and a moderate strengthening over the north, in response to a decline of 78% (24%) in SIC over the Arctic (Antarctic) in the June–September season. The changes in the LPS activity in response to polar sea ice melt are found to be mostly driven by the changes in low‐level absolute vorticity and vertical shear over the Bay of Bengal.

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Section: Introductionmentioning

confidence: 99%

Weakening of Indian Summer Monsoon Synoptic Activity in Response to Polar Sea Ice Melt Induced by Albedo Reduction in a Climate Model

Chandra

Sandeep

Suhas

et al. 2022

Earth and Space Science

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“…So as a result, it led to intensified (diminished) convective activity over the peninsular India, and increased (decreased) precipitation over peninsular India during high (low) ice index years. Prabhu et al (2021) displayed that SIC anomalies in the South Polar region are able to impact the sea surface temperatures (SST) within the equatorial central (western) Pacific, thereby affecting summer monsoon in peninsular India. Makula and Zhou (2023) made a discovery linking the positive spring sea ice anomalies in Antarctic to the upper-level wave train patterns traveling from high to low latitudes in the SH.…”

Section: Introductionmentioning

confidence: 99%

Interannual Variability of August Precipitation in China Associated With the Antarctic Sea Ice Anomaly

Xiao,

Duan,

et al. 2024

JGR Atmospheres

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Through observational analysis and atmospheric simulation experiments, the relationship between sea ice in the region of South Pole and August precipitation in China was determined. Results indicate that the leading mode of August precipitation in China is significantly correlated with July sea ice concentration (SIC) in South Pole, specifically in eastern Indian Ocean (EIO) region. Typically, the SIC growth is followed by positive rainfall anomalies in the middle and lower reaches of Yangtze River Basin (YRB) and Northeast China (NEC), while South China (SC) is under the control of negative rainfall anomalies. Precisely, owing to the temporal persistence of sea ice in the South Polar region from May to August, sea ice anomalies exert a strong influence on August atmospheric stability in EIO of Southern Hemisphere via regulating turbulent heat flux and air temperature anomalies. As SIC increases, the atmospheric circulation in horizontal exhibits the characteristics of the Antarctic Oscillation (AAO) positive phase, affecting the zonal wind anomalies. Subsequently, the anomalous circulation with a barotropic structure propagates to Australia and the East Asian via the strengthened vertical meridional cells and zonal winds. Moreover, numerical simulations confirm that due to the growth of South Polar sea ice in EIO, abnormal cyclone and anticyclone appear over North China and SC respectively, together with the moisture converging anomalies in the middle and lower reaches of YRB, and diverging anomalies in SC. Accordingly, these atmospheric circulation anomalies triggered by Antarctic sea ice conducive to a wet (dry) August in northern (southern) China.

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“…Small variations in the ISM's intensity or a delay in it led to numerous major effects on people's lives in terms of the economy and the environment due to floods and droughts. Based on the statistical analysis of observed data, previous studies have established a connection between the ISM rainfall and sea ice variability in the Arctic and Antarctic regions (Prabhu et al, 2012;Guo et al, 2014;Chatterjee et al, 2021;Prabhu et al, 2021). Krishnamurti et al (2015); Nuncio et al (2020) have argued that the tropical variability can affect the Arctic sea ice variability.…”

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confidence: 99%

Relative roles of the Arctic and Antarctic sea ice melt on Indian summer monsoon

CHANDRA,

Sukumaran

2023

Preprint

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The response of low-latitude weather and climate to polar sea ice melt is not well understood. In this study, we run a suite of fully coupled simulations using the Community Earth System Model to investigate the effects of polar sea ice melt on Indian summer monsoon (ISM). In the coupled model simulation, the albedo of the sea ice is reduced in such a way that the increased absorption of the solar radiation would melt the sea ice. The effects of the Arctic and Antarctic sea ice melts on the ISM have been examined. The findings reveal that the combined melting of sea ice in the Arctic and Antarctic exerts a stronger influence on the ISM compared to the melting at a single pole. Specifically, the ISM exhibits a relatively weak sensitivity to the Arctic sea ice melt, while showing a stronger response to sea ice melt over the Antarctic and the combined melt over both poles. The response of summer monsoon to sea ice melt is characterized by a weakening of the circulation and a decrease in the continental precipitation, indicating an overall weakening of the monsoon system as a result of the polar sea ice melt. The intertropical convergence zone (ITCZ) and associated precipitation pattern shift equatorward in the sea ice melt experiments.

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Association between Antarctic Sea ice, Pacific SST and the Indian summer monsoon: An observational study

Cited by 7 publications

References 64 publications

Weakening of Indian Summer Monsoon Synoptic Activity in Response to Polar Sea Ice Melt Induced by Albedo Reduction in a Climate Model

Weakening of Indian Summer Monsoon Synoptic Activity in Response to Polar Sea Ice Melt Induced by Albedo Reduction in a Climate Model

Interannual Variability of August Precipitation in China Associated With the Antarctic Sea Ice Anomaly

Relative roles of the Arctic and Antarctic sea ice melt on Indian summer monsoon

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