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Temporal and spatial statistics of travelling eddy variability in the South China Sea
Zhang, Meng1; von Storch, Hans1,2; Chen, Xueen2; Wang, Dongxiao3; Li, Delei4
Source PublicationOCEAN DYNAMICS
Corresponding Authorvon Storch, Hans(
AbstractThe variability across decades of years of migrating eddy activities in the South China Sea (SCS) has not yet been documented. We employ a daily global eddy-resolving (0.1 degrees) model product called STORM that covers a period of 1950-2010 to fill this gap. The frequency and pattern of eddy occurrence in the simulation is broadly consistent with satellite-based (AVISO) data. On average, annually, 28 anticyclonic travelling eddy (AE) tracks and 54 cyclonic travelling eddy (CE) tracks with long travel lengths were derived from the discrete sea surface height anomaly fields of STORM. Eddy centers most frequently pass by the Luzon Strait and along the continental slope in the northern SCS to the Vietnam coast. The lifespans range from 6 to 240 days for AEs and to 293 days for CEs, and the longest travel lengths are 1941 km and 1988 km, respectively. EOFs of the spatial fields of eddy diameter (ED), eddy intensity (EI), and eddy number (EN) show almost white eigenvalue spectra, when calculated on the model's 0.1-degree grid, but when the data are coarsened to grids with 1-degree and 2-degree grid spacing, meaningful structures emerge. EI and ED are highly correlated on both seasonal and interannual time scales. In general, CEs are much more active than AEs, but the AEs with high intensities or large diameters are more frequent than similar CEs. The monthly ED, EI, and EN exhibit annual cycles, which are, however, not very stable. The variabilities of annual means of ED, EI, and EN are large at interannual time scales, are little at interdecadal sales, and exhibit hardly a trend. The sizes and intensities of eddies in the SCS are hardly connected to the ENSO-variability in the tropical Pacific. The EOFs, the weakness of the annual cycle stability and the absence of a correlation with ENSO, point to a massive presence of internal variability (as opposed to variability provoked by large-scale drivers).
KeywordSouth China Sea Statistics of travelling eddies Variability of characteristics of eddies Simulation with eddy-permitting model Internal vs. external variability
Indexed BySCI
Funding ProjectChina Scholarship Council[201406330048] ; National Key Research and Development Plan[2017YFA0604101] ; Taishan Scholars program
WOS Research AreaOceanography
WOS SubjectOceanography
WOS IDWOS:000489564300001
Citation statistics
Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Corresponding Authorvon Storch, Hans
Affiliation1.Helmholtz Zentrum Geesthacht Ctr Mat & Coastal Re, Inst Coastal Res, Max Planck Str 1, D-21502 Geesthacht, Germany
2.Ocean Univ China, Coll Ocean & Atmospher Sci, Qingdao, Shandong, Peoples R China
3.Chinese Acad Sci, South China Sea Inst Oceanol, State Key Lab Trop Oceanog, Guangzhou, Guangdong, Peoples R China
4.Chinese Acad Sci, Inst Oceanol, Key Lab Ocean Circulat & Waves, Qingdao, Shandong, Peoples R China
Recommended Citation
GB/T 7714
Zhang, Meng,von Storch, Hans,Chen, Xueen,et al. Temporal and spatial statistics of travelling eddy variability in the South China Sea[J]. OCEAN DYNAMICS,2019,69(8):879-898.
APA Zhang, Meng,von Storch, Hans,Chen, Xueen,Wang, Dongxiao,&Li, Delei.(2019).Temporal and spatial statistics of travelling eddy variability in the South China Sea.OCEAN DYNAMICS,69(8),879-898.
MLA Zhang, Meng,et al."Temporal and spatial statistics of travelling eddy variability in the South China Sea".OCEAN DYNAMICS 69.8(2019):879-898.
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