The role of the south-east Asian monsoon and other seasonal features in creating the ‘tape-recorder’ signal in the Unified Model

2004 ◽  
Vol 130 (599) ◽  
pp. 1531-1554 ◽  
Author(s):  
R. N. Bannister ◽  
A. O'neill ◽  
A. R. Gregory ◽  
K. M. Nissen
Keyword(s):  
Asian Monsoon ◽  
East Asian Monsoon ◽  
East Asian ◽  
Unified Model ◽  
Tape Recorder ◽  
The South

Late Quaternary coccolith records in the South China Sea and East Asian monsoon dynamics

2013 ◽  
Vol 111 ◽  
pp. 88-96 ◽  
Author(s):  
Xiang Su ◽  
Chuanlian Liu ◽  
Luc Beaufort ◽  
Jun Tian ◽  
Enqing Huang
Keyword(s):  
South China Sea ◽  
South China ◽  
Asian Monsoon ◽  
East Asian Monsoon ◽  
Late Quaternary ◽  
East Asian ◽  
The South China Sea ◽  
The South ◽  
China Sea ◽  
Monsoon Dynamics

Is 2020 super Meiyu a result of changing annual cycle of East Asian monsoon?

2021 ◽  
Author(s):  
Mengqian Lu ◽  
Mengxin Pan ◽  
Lun Dai ◽  
Tat Fan Cheng
Keyword(s):  
High Pressure ◽  
South Asian ◽  
Annual Cycle ◽  
Asian Monsoon ◽  
East Asian Monsoon ◽  
East Asian ◽  
Rain Belt ◽  
The South ◽  
Geophysical Research ◽  
Northward Propagation

<p>2020 was exceedingly difficult for humans. As the world was experienced surge waves of COVID19, East Asia was also facing a one in a century, record-breaking flood,  as the result of a super 47-day Meiyu/Baiu stage of East Asian summer monsoon. As East Asian monsoons (EAM) follow a yearly cyclical pattern, we wonder which stage(s) were collateral damages of the extended Meiyu. Was it an early termination of the anomalous dry Spring, or was it a delayed northward propagation of the rain belt, i.e. late Mid-summer? The hypothesis stems from our recent finding (Dai et al., 2020) that the duration of the Spring stage is informative for the onset of Meiyu, while the duration of Meiyu is negatively correlated with that of Mid-summer, i.e., the longer the Meiyu, the shorter the Mid-summer. To verify this, we first positioned the 2020 pre-Meiyu, Meiyu, Mid-summer stages in the 40-year climatology annual cycle (Dai et al., 2020). Although neither the onset nor the termination was beyond the 40-year variance, Meiyu indeed hastened to arrive but postponed its departure. Rain belt stalled over the Yangtze river basin and southern Japan since mid-June; until the end of July, a planetary-scale anomalous high pressure band was in place encompassing the Arabian sea and north Pacific. It hindered the South Asian monsoonal flow to the South China Sea, curbing the northward propagation of the rain belt with assistance by both southeast-ward shift of South Asian High and lower level high pressure system persistent over the northern China. With these observations, we put forward a framework of ocean-atmosphere coupled mechanisms that traces back to the summer in 2019, and reveal the climate teleconnection and circulation systems that pave the road to the 2020 super Meiyu. With this study, we address the question of whether the 2020 super Meiyu was a “black swan” or a manifestation of ongoing systematic changes of the EAM annual cycle?</p><p> </p><p> </p><p> </p><p>Reference</p><p>Dai, L., Cheng, T. F., & Lu, M. (2020). Define East Asian monsoon annual cycle via a self‐organizing map‐based approach. Geophysical Research Letters, 47. e2020GL089542. https://doi.org/10.1029/2020GL089542</p>

scholarly journals The role of land and ocean evaporation on the variability of precipitation in the Yangtze River valley

2019 ◽  
Vol 23 (6) ◽  
pp. 2525-2540 ◽  
Author(s):  
Astrid Fremme ◽  
Harald Sodemann
Keyword(s):  
Yangtze River ◽  
Asian Monsoon ◽  
East Asian Monsoon ◽  
East Asian ◽  
Precipitation Variability ◽  
Yangtze River Valley ◽  
The Yangtze River ◽  
Moisture Source ◽  
Moisture Sources

Abstract. The Yangtze River valley (YRV) experiences large intraseasonal and interannual precipitation variability, which is mainly due to East Asian monsoon influence. The East Asian monsoon is caused by interaction of many processes in the coupled land–atmosphere–ocean system. To better understand YRV precipitation variability in this complex system, we have studied the precipitation moisture sources and their connection to YRV precipitation. We obtained the moisture sources by using the European Centre for Medium-Range Weather Forecasts' (ECMWF) ERA-Interim reanalysis dataset, the FLEXible PARTicle dispersion model (FLEXPART), and the WaterSip moisture source diagnostic. The variability of moisture sources reflects the variability of YRV precipitation. Intraseasonal variations of moisture sources include a shift of the most important source regions as the monsoon progresses. Interannual variability of the moisture sources shows that sources which are less important climatologically are closely connected to variations of the driest and wettest years. Our results show that land directly contributes 58 % of moisture for YRV precipitation during 1980–2016, whereas the ocean contributes 42 % in direct transport. While the importance of the ocean as a moisture source is often emphasized, our results underscore the importance of the process of continental recycling and the role of land moisture sources.

Coupled Effects of Moisture Transport Pathway and Convection on Stable Isotopes in Precipitation across the East Asian Monsoon Region: Implications for Paleoclimate Reconstruction

2021 ◽  
pp. 1-41
Author(s):  
Jingyi Zhang ◽  
Wusheng Yu ◽  
Zhaowei Jing ◽  
Stephen Lewis ◽  
Baiqing Xu ◽  
...  
Keyword(s):  
Moisture Transport ◽  
Asian Monsoon ◽  
East Asian Monsoon ◽  
Monsoon Season ◽  
East Asian ◽  
Monsoon Region ◽  
The South ◽  
Transport Pathway ◽  
Asian Monsoon Region ◽  
The North

AbstractThis study investigated the variations in stable oxygen isotopes in daily precipitation (δ18Op) collected between 2010 and 2013 at four sites across the East Asian monsoon region to address the controversy whether local meteorological factors, moisture transport pathway or convection dominates the δ18Op changes. We found that the δ18Op time series exhibit opposite seasonal patterns between the southern and northern sites; however, relatively low δ18Op values occur at each site during summer. The opposite seasonal patterns are closely related to the proportional change in the contributions from oceanic (> 52% in the south) and continental (> 85% in the north) moisture sources. Moisture transport distances also influence the seasonal δ18Op fluctuations. In the south, the moisture transported over short distances from the middle of the western Pacific Ocean results in relatively high δ18Op values during the pre-monsoon season. In contrast, long-distance transport of moisture from the Indian and Equatorial Pacific Oceans during the monsoon season results in relatively low δ18Op values. In the north, relatively low δ18Op values during the monsoon season can be attributed to an increase in relatively distant moisture originated from the middle of the western Pacific Ocean. Convection only plays a role in affecting δ18Op values in the south during the monsoon season. Our study suggests that moisture transport pathway (moisture sources and moisture transport distances) is a major factor that governs seasonal variations in δ18Op across the East Asian monsoon region, which has implications for the interpretation of paleoclimate records from this region.

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