Influence of Central Siberian snow‐albedo feedback on the spring East Asian dust cycle and connection with the preceding winter Arctic oscillation
The Asian dust cycle has significant effects on the climate and environment, while its spatiotemporal variability and change mechanisms are not yet completely understood. Reanalysis data from the Modern‐Era Retrospective Analysis for Research and Applications, version 2 (MERRA2), data set are used t...
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American Geophysical Union
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ftunivreading:oai:centaur.reading.ac.uk:81145 2024-09-15T17:35:48+00:00 Influence of Central Siberian snow‐albedo feedback on the spring East Asian dust cycle and connection with the preceding winter Arctic oscillation Liu, Heng Liu, Xiaodong Dong, Buwen 2018-12-16 text https://centaur.reading.ac.uk/81145/ https://centaur.reading.ac.uk/81145/8/Liu_et_al-2018-Journal_of_Geophysical_Research__Atmospheres.pdf https://centaur.reading.ac.uk/81145/1/Liu_etal_EA_dust_cycle_AO_2018.pdf en eng American Geophysical Union https://centaur.reading.ac.uk/81145/8/Liu_et_al-2018-Journal_of_Geophysical_Research__Atmospheres.pdf https://centaur.reading.ac.uk/81145/1/Liu_etal_EA_dust_cycle_AO_2018.pdf Liu, H., Liu, X. and Dong, B. <https://centaur.reading.ac.uk/view/creators/90000933.html> orcid:0000-0003-0809-7911 (2018) Influence of Central Siberian snow‐albedo feedback on the spring East Asian dust cycle and connection with the preceding winter Arctic oscillation. Journal of Geophysical Research: Atmospheres, 123 (23). 13,368-13,385. ISSN 2169-8996 doi: https://doi.org/10.1029/2018JD029385 <https://doi.org/10.1029/2018JD029385> Article PeerReviewed 2018 ftunivreading https://doi.org/10.1029/2018JD029385 2024-06-25T15:02:19Z The Asian dust cycle has significant effects on the climate and environment, while its spatiotemporal variability and change mechanisms are not yet completely understood. Reanalysis data from the Modern‐Era Retrospective Analysis for Research and Applications, version 2 (MERRA2), data set are used to explore the spatiotemporal distribution of the East Asian dust cycle and possible reasons for the interannual variations. Based on the empirical orthogonal function analysis, the dominant mode of dust emissions from the East Asian deserts in the dust season (spring) shows that the Gobi Desert contributes most of the interannual variance of dust emissions in East Asia. The patterns of the regional circulation, temperature, and radiation are analyzed by regressing these variables against the principal component time series of the first empirical orthogonal function mode. The results show that the enhanced dust emissions are associated with a cyclonic circulation anomaly and cooling in the lower and middle troposphere over Central Siberia. The cooling is attributed to local snow‐albedo and cloud‐albedo feedbacks. The surface cooling is conducive to maintain the snow cover, whereas the cooling in the middle troposphere is associated with the increase of the relative humidity and cloud cover. The increased snow and cloud cover reflect more shortwave radiation, tending to maintain or amplify the surface cooling. It is also found that the negative phase of the Arctic Oscillation in winter initiates the surface cooling in the next spring and results in positive snow‐albedo and cloud feedbacks in Central Siberia, eventually enhancing the East Asian dust cycle. Article in Journal/Newspaper albedo Arctic Siberia CentAUR: Central Archive at the University of Reading Journal of Geophysical Research: Atmospheres 123 23 |
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CentAUR: Central Archive at the University of Reading |
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ftunivreading |
language |
English |
description |
The Asian dust cycle has significant effects on the climate and environment, while its spatiotemporal variability and change mechanisms are not yet completely understood. Reanalysis data from the Modern‐Era Retrospective Analysis for Research and Applications, version 2 (MERRA2), data set are used to explore the spatiotemporal distribution of the East Asian dust cycle and possible reasons for the interannual variations. Based on the empirical orthogonal function analysis, the dominant mode of dust emissions from the East Asian deserts in the dust season (spring) shows that the Gobi Desert contributes most of the interannual variance of dust emissions in East Asia. The patterns of the regional circulation, temperature, and radiation are analyzed by regressing these variables against the principal component time series of the first empirical orthogonal function mode. The results show that the enhanced dust emissions are associated with a cyclonic circulation anomaly and cooling in the lower and middle troposphere over Central Siberia. The cooling is attributed to local snow‐albedo and cloud‐albedo feedbacks. The surface cooling is conducive to maintain the snow cover, whereas the cooling in the middle troposphere is associated with the increase of the relative humidity and cloud cover. The increased snow and cloud cover reflect more shortwave radiation, tending to maintain or amplify the surface cooling. It is also found that the negative phase of the Arctic Oscillation in winter initiates the surface cooling in the next spring and results in positive snow‐albedo and cloud feedbacks in Central Siberia, eventually enhancing the East Asian dust cycle. |
format |
Article in Journal/Newspaper |
author |
Liu, Heng Liu, Xiaodong Dong, Buwen |
spellingShingle |
Liu, Heng Liu, Xiaodong Dong, Buwen Influence of Central Siberian snow‐albedo feedback on the spring East Asian dust cycle and connection with the preceding winter Arctic oscillation |
author_facet |
Liu, Heng Liu, Xiaodong Dong, Buwen |
author_sort |
Liu, Heng |
title |
Influence of Central Siberian snow‐albedo feedback on the spring East Asian dust cycle and connection with the preceding winter Arctic oscillation |
title_short |
Influence of Central Siberian snow‐albedo feedback on the spring East Asian dust cycle and connection with the preceding winter Arctic oscillation |
title_full |
Influence of Central Siberian snow‐albedo feedback on the spring East Asian dust cycle and connection with the preceding winter Arctic oscillation |
title_fullStr |
Influence of Central Siberian snow‐albedo feedback on the spring East Asian dust cycle and connection with the preceding winter Arctic oscillation |
title_full_unstemmed |
Influence of Central Siberian snow‐albedo feedback on the spring East Asian dust cycle and connection with the preceding winter Arctic oscillation |
title_sort |
influence of central siberian snow‐albedo feedback on the spring east asian dust cycle and connection with the preceding winter arctic oscillation |
publisher |
American Geophysical Union |
publishDate |
2018 |
url |
https://centaur.reading.ac.uk/81145/ https://centaur.reading.ac.uk/81145/8/Liu_et_al-2018-Journal_of_Geophysical_Research__Atmospheres.pdf https://centaur.reading.ac.uk/81145/1/Liu_etal_EA_dust_cycle_AO_2018.pdf |
genre |
albedo Arctic Siberia |
genre_facet |
albedo Arctic Siberia |
op_relation |
https://centaur.reading.ac.uk/81145/8/Liu_et_al-2018-Journal_of_Geophysical_Research__Atmospheres.pdf https://centaur.reading.ac.uk/81145/1/Liu_etal_EA_dust_cycle_AO_2018.pdf Liu, H., Liu, X. and Dong, B. <https://centaur.reading.ac.uk/view/creators/90000933.html> orcid:0000-0003-0809-7911 (2018) Influence of Central Siberian snow‐albedo feedback on the spring East Asian dust cycle and connection with the preceding winter Arctic oscillation. Journal of Geophysical Research: Atmospheres, 123 (23). 13,368-13,385. ISSN 2169-8996 doi: https://doi.org/10.1029/2018JD029385 <https://doi.org/10.1029/2018JD029385> |
op_doi |
https://doi.org/10.1029/2018JD029385 |
container_title |
Journal of Geophysical Research: Atmospheres |
container_volume |
123 |
container_issue |
23 |
_version_ |
1810479717342511104 |