scholarly journals Convection Initiation in Monsoon Coastal Areas (South China)

2020 ◽  
Vol 47 (11) ◽  
Author(s):  
Lanqiang Bai ◽  
Guixing Chen ◽  
Ling Huang
Keyword(s):  
South China ◽  
Coastal Areas ◽  
Convection Initiation

scholarly journals Image Processing of Radar Mosaics for the Climatology of Convection Initiation in South China

2020 ◽  
Vol 59 (1) ◽  
pp. 65-81 ◽  
Author(s):  
Lanqiang Bai ◽  
Guixing Chen ◽  
Ling Huang
Keyword(s):  
South China ◽  
Numerical Models ◽  
Early Morning ◽  
Moist Convection ◽  
Late Night ◽  
Morning Peak ◽  
Spatial Modes ◽  
Triggering Mechanisms ◽  
Deep Moist Convection ◽  
Convection Initiation

AbstractA dataset of convection initiation (CI) is of great value in studying the triggering mechanisms of deep moist convection and evaluating the performances of numerical models. In recent years, the data quality of the operationally generated radar mosaics over China has been greatly improved, which provides an opportunity to retrieve a CI dataset from that region. In this work, an attempt is made to reveal the potential of applying a simple framework of objective CI detection for the study of CI climatology in China. The framework was tested using radar mosaic maps in South China that were accessible online. The identified CI events were validated in both direct and indirect ways. On the basis of a direct manual check, nearly all of the identified CI cells had an organized motion. The precipitation echoes of the cells had a median duration of approximately 2.5 h. The CI occurrences were further compared with rainfall estimates to ensure physical consistency. The diurnal cycle of CI occurrence exhibits three major modes: a late-night-to-morning peak at the windward coasts and offshore, a noon-to-late-afternoon peak on the coastal land, and an evening-to-early-morning peak over the northwestern highland. These spatial modes agree well with those of rainfall, indirectly suggesting the reliability of the CI statistics. By processing radar mosaic maps, such a framework could be applied for studying CI climatology over China and other regions.

Heavy metal pollution in coastal areas of South China: A review

2013 ◽  
Vol 76 (1-2) ◽  
pp. 7-15 ◽  
Author(s):  
Shuai-Long Wang ◽  
Xiang-Rong Xu ◽  
Yu-Xin Sun ◽  
Jin-Ling Liu ◽  
Hua-Bin Li
Keyword(s):  
Heavy Metal ◽  
South China ◽  
Metal Pollution ◽  
Heavy Metal Pollution ◽  
Coastal Areas

Detrital zircon U–Pb dating of Late Triassic Wenbinshan Formation in southwestern Fujian, South China, and its geological significance

2018 ◽  
Vol 55 (8) ◽  
pp. 980-996 ◽  
Author(s):  
Zhongjie Xu ◽  
Yizhi Lan ◽  
Jintao Kong ◽  
Rihui Cheng ◽  
Liaoliang Wang
Keyword(s):  
South China ◽  
Detrital Zircon ◽  
Coastal Areas ◽  
Late Triassic ◽  
Late Paleozoic ◽  
Age Composition ◽  
Zircon Age ◽  
Early Mesozoic ◽  
Similarities And Differences ◽  
Southwestern Fujian

Based on research of the petrology, geochemistry, and zircon U–Pb dating of detrital rocks in the Late Triassic Wenbinshan Formation in southwestern Fujian, and comparing the detrital zircon ages of Wenbinshan Formation with those of Late Paleozoic – Early Mesozoic main basins in South China, the sedimentary provenance of the Late Triassic in southwestern Fujian and its implications for changes in basin properties are discussed. The research results demonstrate that there is a major age peak at 222 Ma, two subordinate age peaks at 275 Ma and 1851 Ma, and two minor age peaks at 413 Ma and 2447 Ma in the detrital zircon age spectra of the upper samples (YGP–6) of the Wenbinshan Formation, whereas there are two major age peaks at 229 Ma and 1817 Ma and other minor age peaks 265 Ma 309 Ma, 415 Ma, 1968 Ma, and 2435 Ma in the detrital zircon age spectra of the lower samples (YGP–26) of the Wenbinshan Formation. The upper samples contain fewer old detrital zircons than the lower samples, but the upper and lower samples of Wenbinshan Formation are similar in major age composition, which indicates the main provenances of the upper and lower sediments are very similar. The source rocks are mainly sedimentary rocks and their provenances are derived from a source area of recycled orogenic belt and volcanic arc orogenic belt (acidic island arc). The detrital zircon composition of the Wenbinshan Formation is mainly composed of Paleoproterozoic zircon and Late Paleozoic – Early Mesozoic zircon. In the Paleoproterozoic, sedimentary provenances were mainly derived from the Wuyi Massif and partly from northwestern Fujian-southwestern Zhejiang. As for the period of Late Paleozoic – Early Mesozoic, the provenances of the Wenbinshan Formation were derived from magmatic active belts of the Early Indosinian Epoch of northern South China, eastern South China, and the Indosinian Period of northern South China and coastal areas of eastern South China. The similarities and differences between detrital zircon age peaks of the Wenbinshan Formation in southwestern Fujian and that of the main basins in South China during the period of Late Paleozoic – Early Mesozoic indicate that from eastern coastal areas of South China to the north and interior of South China, the age composition of basin sediments has changed from simple to relatively complex, and from young sediments to older sediments. There are similarities and differences in the detrital zircon compositions of the different basins, which can indicate differences in the nature of the basins.

scholarly journals A Review of Assessment and Adaptation Strategy to Climate Change Impacts on the Coastal Areas in South China

2013 ◽  
Vol 4 (4) ◽  
pp. 201-207 ◽  
Author(s):  
Du Yao-Dong ◽  
Cheng Xu-Hua ◽  
Wang Xian-Wei ◽  
Ai Hui ◽  
Duan Hai-Lai ◽  
...  
Keyword(s):  
Climate Change ◽  
South China ◽  
Climate Change Impacts ◽  
Adaptation Strategy ◽  
Coastal Areas

scholarly journals Convection Initiation and Growth at the Coast of South China. Part I: Effect of the Marine Boundary Layer Jet

2020 ◽  
Vol 148 (9) ◽  
pp. 3847-3869 ◽  
Author(s):  
Yu Du ◽  
Guixing Chen ◽  
Bin Han ◽  
Chuying Mai ◽  
Lanqiang Bai ◽  
...  
Keyword(s):  
Boundary Layer ◽  
South China ◽  
Marine Boundary Layer ◽  
Rapid Development ◽  
Northern South China Sea ◽  
Heavy Rainfall Event ◽  
Inertial Oscillation ◽  
Low Level ◽  
Convergence Zones ◽  
Convection Initiation

Abstract Convection initiation (CI) and the subsequent upscale convective growth (UCG) at the coast of South China in a warm-sector heavy rainfall event are shown to be closely linked to a varying marine boundary layer jet (MBLJ) over the northern South China Sea (NSCS). To elucidate the dynamic and thermodynamic roles of the MBLJ in CI and UCG, we conducted and analyzed convection-permitting numerical simulations and observations. Compared to radar observations, the simulations captured CI locations and the following southwest–northeast-oriented convection development. The nocturnal MBLJ peaks at 950 hPa and significantly intensifies with turning from southwesterly to nearly southerly by inertial oscillation. The strengthened MBLJ promotes mesoscale ascent on its northwestern edge and terminus where enhanced convergence zones occur. Located directly downstream of the MBLJ, the coastal CI and UCG are dynamically supported by mesoscale ascent. From a thermodynamic perspective, a warm moist tongue over the NSCS is strengthened by the MBLJ-driven mesoscale ascent as well as by a high sea surface temperature. The warm moist tongue farther extends northeastward by horizontal transport and arrives at the coast where CI and UCG occur. Near the CI location, rapid development of a low-level saturated layer is mainly attributed to the mesoscale ascent and low-level moistening associated with the MBLJ. In addition, subsequent CI happens on either side of the original CI along the coast due to the delay of low-level moistening, which partly contributes to linear convective growth. Furthermore, ensemble simulations confirmed that a stronger MBLJ is more favorable to CI and UCG near the coast.

scholarly journals Projection of Tsunami Wave Height at East-Coast of Peninsular Malaysia using Green’s Law

2018 ◽  
Vol 7 (4.35) ◽  
pp. 270
Author(s):  
A. F. Aziz ◽  
N. H. Mardi ◽  
M. A. Malek
Keyword(s):  
South China Sea ◽  
Wave Height ◽  
South China ◽  
Arrival Time ◽  
East Coast ◽  
Tsunami Wave ◽  
Peninsular Malaysia ◽  
Coastal Areas ◽  
Manila Trench ◽  
Tsunami Wave Height

In recent years, studies regarding a new source of tsunami-genic earthquake at South China Sea region known as Manila Trench earthquake have attracted the attention of many researchers. It is expected that this subduction zone is capable to trigger large moment magnitude earthquake and affects countries located within South China Sea. The objective of this study is to project tsunami wave height and arrival time generated from Manila Trench earthquake towards coastal areas located along east-coast of Peninsular Malaysia. This study focuses on simulating tsunami at four different moment magnitudes by using TUNA-M2 model to record wave height and arrival time at the offshore areas. Then the Green’s law is used to approximate reliable tsunami wave height when approaching onshore. Results obtained in this study showed that tsunami waves from Manila Trench are estimated to arrive at coastal areas of east-coast Peninsular Malaysia between 9.1 to 10.25 hours post-earthquake occurrence. The observation points located at offshore of Kelantan are anticipated to experience the highest wave height as compared to other observation points located at offshore areas of Terengganu and Pahang. This study is important to the coastal communities as it provides vital information on possible tsunami occurrences in the future.

scholarly journals The Invasion of Coastal Areas in South China by Ipomoea cairica May Be Accelerated by the Ecotype Being More Locally Adapted to Salt Stress

PLoS ONE ◽  
2016 ◽  
Vol 11 (2) ◽  
pp. e0149262 ◽  
Author(s):  
Gang Liu ◽  
Yang Gao ◽  
Fang-Fang Huang ◽  
Ming-Yue Yuan ◽  
Shao-Lin Peng
Keyword(s):  
Salt Stress ◽  
South China ◽  
Coastal Areas
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