Assessment of Antarctic Amplification Based on a Reconstruction of Near-Surface Air Temperature

Jun, Zhu; Xie, Aihong; Qin, Xiang; Xu, Bing; Wang, Yicheng

doi:10.3390/atmos14020218

Cited by 3 publications

(2 citation statements)

References 43 publications

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“…A positive Antarctic amplification index appears only in austral spring, and the warming rate for Antarctica is slightly lower than that of the global land region mean. In SON, i.e., austral spring, the warming signals are concentrated on East Antarctica; this finding is closely related to changes in the Southern Annular Mode [29,44]. In MAM, the austral autumn, and JJA, the austral winter, obvious negative Antarctic amplification can be observed, with amplification indexes of −1.68 and −2.73, respectively.…”

Section: Comparison Of Amplification At the Earth's Three Polesmentioning

confidence: 83%

Polar Amplification in the Earth’s Three Poles Based on MODIS Land Surface Temperatures

Xie,

Zhu,

Wang

et al. 2023

Remote Sensing

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Polar amplification appears in response to greenhouse gas forcing, which has become a focus of climate change research. However, polar amplification has not been systematically investigated over the Earth’s three poles (the Arctic, Antarctica, and the Third Pole). An index of polar amplification is employed, and the annual and seasonal variations of land surface temperature over the Earth’s three poles are examined using MODIS (Moderate Resolution Imaging Spectroradiometer) observations for the period 2001–2018. As expected, the warming of the Arctic is most conspicuous, followed by the Third Pole, and is weakest in Antarctica. Compared to the temperature changes for the global land region, positive polar amplification appears in the Arctic and the Third Pole on an annual scale, whereas Antarctic amplification disappears, with a negative amplification index of −0.72. The polar amplification for the Earth’s three poles shows seasonal differences. Strong Arctic amplification appears in boreal spring and winter, with a surface warming rate of more than 3.40 times the global mean for land regions. In contrast, the amplification of the Third Pole is most conspicuous in boreal summer. The two poles located in the Northern Hemisphere have the weakest amplification in boreal autumn. Differently from the positive amplification for the Arctic and the Third Pole in all seasons, the faster variations in Antarctic temperature compared to the globe only appear in austral autumn and winter, and the amplification signal is negative in these seasons, with an amplification index of −1.68 and −2.73, respectively. In the austral winter, the strong negative amplification concentrates on West Antarctica and the coast of East Antarctica, with an absolute value of amplification index higher than 5 in general. Generally, the polar amplification is strongest in the Arctic except from June to August, and Antarctic amplification is the weakest among the Earth’s three poles. The Earth’s three poles are experiencing drastic changes, and the potential influence of climate change should receive attention.

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Section: Comparison Of Amplification At the Earth's Three Polesmentioning

confidence: 83%

Polar Amplification in the Earth’s Three Poles Based on MODIS Land Surface Temperatures

Xie,

Zhu,

Wang

et al. 2023

Remote Sensing

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“…For the period 1979-2019, obvious AnA occurs in austral spring, although it disappears on an annual scale [37]. However, AnA can be observed on all annual and seasonal scales during the period 2002-2018 [38]. In addition, AnA is likely to be delayed relative to the Arctic amplification, and AnA is highly likely to occur in the future [39].…”

Section: Introductionmentioning

confidence: 98%

The Antarctic Amplification Based on MODIS Land Surface Temperature and ERA5

et al. 2023

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With global warming accelerating, polar amplification is one of the hot issues in climate research. However, most studies focus on Arctic amplification, and little attention has been paid to Antarctic amplification (AnA), and there is no relevant research based on MODIS (Moderate Resolution Imaging Spectroradiometer) land surface temperature observations. Compared with 128 stations’ observations, MODIS can capture the variations in temperature over Antarctica. In addition, the temperature changes in Antarctica, East Antarctica, West Antarctica and the Antarctic Peninsula during the period 2001–2018 reflected by the MODIS and ERA5 are basically consistent, and the temperature changes in Antarctica are negatively correlated with the Southern Annular Mode. AnA occurs under all annual and seasonal scales, with an AnA index greater than 1.27 (1.31) from the MODIS (ERA5), and is strongest in the austral winter and weakest in summer. AnA displays regional differences, and the signal from the MODIS is similar to that from ERA5. The strongest amplification occurs in East Antarctica, with an AnA index greater than 1.45 (1.48) from the MODIS (ERA5), followed by West Antarctica, whereas the amplified signal is absent at the Antarctic Peninsula. In addition, seasonal differences can be observed in the sub regions of Antarctica. For West Antarctica, the greatest amplification appears in austral winter, and in austral spring for East Antarctica. The AnA signal also can be captured in daytime and nighttime observations, and the AnA in nighttime observations is stronger than that in daytime. Generally, the MODIS illustrates the appearance of AnA for the period 2001–2018, and the Antarctic climate undergoes drastic changes, and the potential impact should arouse attention.

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Temperature Anomalies in the Northern and Southern Hemispheres: Evidence of Persistence and Trends

Gil-Alana,

Carmona-González

2024

Advances in Meteorology

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This paper analyses temperature anomalies in the northern and southern hemispheres, and the differences between the two in order to estimate the time trend coefficients and the degrees of persistence in the data. Analysing the entire sample period (from 1880m1 to 2022m10), the results indicate lower degrees of persistence and more acute trends in northern hemisphere temperatures. We also observe some degree of persistence and a positive trend for the differenced series. Finally, observing the evolution of these two factors over the last 50 years, we see that in northern temperatures, both the degree of persistence and the time trend have increased over time, whereas similar increases were not observed in southern temperatures.

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Assessment of Antarctic Amplification Based on a Reconstruction of Near-Surface Air Temperature

Cited by 3 publications

References 43 publications

Polar Amplification in the Earth’s Three Poles Based on MODIS Land Surface Temperatures

Polar Amplification in the Earth’s Three Poles Based on MODIS Land Surface Temperatures

The Antarctic Amplification Based on MODIS Land Surface Temperature and ERA5

Temperature Anomalies in the Northern and Southern Hemispheres: Evidence of Persistence and Trends

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