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1. A new DRP-4DVar-based coupled data assimilation system for decadal predictions using a fast online localization technique

Author:
He, Yujun; Wang, Bin; Huang, Wenyu; Xu, Shiming; Wang, Yong; Liu, Li; Li, Lijuan; Liu, Juanjuan; Yu, Yongqiang; Lin, Yanluan; Huang, Xiaomeng; Peng, Yiran
Source:
Climate dynamics 2020 v.54 no.7-8 pp. 3541-3559
ISSN:
0930-7575
Subject:
El Nino; air temperature; climate; climatology; prediction; salinity; water temperature; Eurasia; Indian Ocean
Abstract:
... A new coupled data assimilation (CDA) system based on dimension-reduced projection four-dimensional variational data assimilation (DRP-4DVar) for decadal predictions is developed and applied to a fully coupled model FGOALS-g2, which applies a fast online localization technique. The improved CDA system can assimilate more observational information than the previous system, with a larger reduction i ...
DOI:
10.1007/s00382-020-05190-w

2. Record-breaking heat wave in southern China and delayed onset of South China Sea summer monsoon driven by the Pacific subtropical high

Author:
Deng, Kaiqiang; Yang, Song; Gu, Dejun; Lin, Ailan; Li, Chunhui
Source:
Climate dynamics 2020 v.54 no.7-8 pp. 3751-3764
ISSN:
0930-7575
Subject:
air; air temperature; climate; heat; moisture diffusivity; monsoon season; oceans; prediction; probability; rain; spring; summer; wind direction; China; South China Sea
Abstract:
... We investigate a record-breaking heat wave in southern China (SC) and explore its association with the South China Sea (SCS) summer monsoon (SCSSM), using station observations and various reanalysis products. This heat wave event started in mid-May 2018 and persisted more than 15 days, when the maximum air temperature anomaly exceeded 6 °C. Meanwhile, the onset of the SCSSM was extremely late in 2 ...
DOI:
10.1007/s00382-020-05203-8

3. Seasonal prediction of the northern and southern temperature modes of the East Asian winter monsoon: the importance of the Arctic sea ice

Author:
Zhang, Peng; Wu, Zhiwei; Li, Jianping; Xiao, Ziniu
Source:
Climate dynamics 2020 v.54 no.7-8 pp. 3583-3597
ISSN:
0930-7575
Subject:
El Nino; air temperature; autumn; climate; cold; cooling; empirical models; monsoon season; prediction; sea ice; snowpack; winter; Arctic Ocean; East Asia
Abstract:
... Previous research work found that two distinct surface air temperature (SAT) modes—the northern (N-) and the southern (S-) modes dominate the East Asian winter monsoon (EAWM) region. The inter-annual variations of these two modes were mainly attributed to preceding Siberian snow cover anomalies and El Niño–Southern Oscillation (ENSO). Observed evidence in this study shows that sea ice anomalies on ...
DOI:
10.1007/s00382-020-05182-w