Study on the differences in water vapour characteristics and predictive signals of low‐frequency precipitation in the pre‐flood season of South China between flood and drought years

2020 ◽  
Vol 40 (15) ◽  
pp. 6587-6602
Author(s):  
Liping Li ◽  
Chenyu Ma ◽  
Chunyan Yang
Keyword(s):  
Water Vapour ◽  
South China ◽  
Low Frequency ◽  
Flood Season

scholarly journals Ancient DNA Evidence from China Reveals the Expansion of Pacific Dogs

2020 ◽  
Vol 37 (5) ◽  
pp. 1462-1469 ◽  
Author(s):  
Ming Zhang ◽  
Guoping Sun ◽  
Lele Ren ◽  
Haibing Yuan ◽  
Guanghui Dong ◽  
...  
Keyword(s):  
South China ◽  
High Frequency ◽  
Yangtze River ◽  
North China ◽  
Yellow River ◽  
Low Frequency ◽  
Gray Wolf ◽  
Pacific Island ◽  
Dna Evidence ◽  
Dog Domestication

Abstract The ancestral homeland of Australian dingoes and Pacific dogs is proposed to be in South China. However, the location and timing of their dispersal and relationship to dog domestication is unclear. Here, we sequenced 7,000- to 2,000-year-old complete mitochondrial DNA (mtDNA) genomes of 27 ancient canids (one gray wolf and 26 domestic dogs) from the Yellow River and Yangtze River basins (YYRB). These are the first complete ancient mtDNA of Chinese dogs from the cradle of early Chinese civilization. We found that most ancient dogs (18/26) belong to the haplogroup A1b lineage that is found in high frequency in present-day Australian dingoes and precolonial Pacific Island dogs but low frequency in present-day China. Particularly, a 7,000-year-old dog from the Tianluoshan site in Zhejiang province possesses a haplotype basal to the entire haplogroup A1b lineage. We propose that A1b lineage dogs were once widely distributed in the YYRB area. Following their dispersal to South China, and then into Southeast Asia, New Guinea and remote Oceania, they were largely replaced by dogs belonging to other lineages in the last 2,000 years in present-day China, especially North China.

Observation and inversion of very-low-frequency seismo-acoustic fields in the South China Sea

2020 ◽  
Vol 148 (6) ◽  
pp. 3992-4001
Author(s):  
Shuyuan Du ◽  
Jingpu Cao ◽  
Shihong Zhou ◽  
Yubo Qi ◽  
Lei Jiang ◽  
...  
Keyword(s):  
South China Sea ◽  
South China ◽  
Low Frequency ◽  
The South China Sea ◽  
Acoustic Fields ◽  
The South ◽  
Very Low Frequency ◽  
China Sea ◽  
And Inversion

Low frequency ambient noise modeling and comparison with field measurements in the South China Sea

2019 ◽  
Vol 148 ◽  
pp. 34-39 ◽  
Author(s):  
JianBo Zhou ◽  
Minhui Zhang ◽  
ShengChun Piao ◽  
Kashif Iqbal ◽  
Ke Qu ◽  
...  
Keyword(s):  
South China Sea ◽  
South China ◽  
Ambient Noise ◽  
Low Frequency ◽  
Field Measurements ◽  
The South China Sea ◽  
The South ◽  
Noise Modeling ◽  
China Sea

scholarly journals Characteristics of Warm Clouds and Precipitation in South China during the Pre-Flood Season Using Datasets from a Cloud Radar, a Ceilometer, and a Disdrometer

2019 ◽  
Vol 11 (24) ◽  
pp. 3045 ◽  
Author(s):  
Jiafeng Zheng ◽  
Liping Liu ◽  
Haonan Chen ◽  
Yabin Gou ◽  
Yuzhang Che ◽  
...  
Keyword(s):  
South China ◽  
Cloud Base ◽  
Vertical Orientation ◽  
Integrated Technology ◽  
Flood Season ◽  
Cloud Radar ◽  
Raindrop Size Distribution ◽  
Type Size ◽  
Raindrop Size ◽  
Rain Rates

The millimeter-wave cloud radar, ceilometer, and disdrometer have been widely used to observe clouds and precipitation. However, there are some drawbacks when those three instruments are solely employed due to their own limitations, such as the fact that radars usually suffer from signal attenuation and ceilometers/disdrometers cannot provide measurements of the hydrometeors of aloft clouds and precipitation. Thus, in this paper, we developed an integrated technology by combining and utilizing the advantages of three instruments together to investigate the vertical structure and diurnal variation of warm clouds and precipitation, and the raindrop size distribution. Specifically, the technology consists of appropriate data processing, quality control, and retrieval methods. It was implemented to study the warm clouds and precipitation in South China during the pre-flood season of 2016. The results showed that the hydrometeors of warm clouds and precipitation were mainly distributed below 2.5 km and most of the rainfall events were very light with a rain rate less than 1 mm h−1, however, the stronger precipitation primarily contributed the accumulated rain amount. Furthermore, a rising trend of cloud base height from 1000 to 1900 BJT was found. The cloud top height and cloud thickness gradually increased from 1200 BJT to reach a maximum at 1600 BJT (Beijing Standard Time, UTC+8), and then decreased until 2000 BJT. Also, three periods of the apparent rainfall on the ground of the day, namely, 0400–0700 BJT, 1400–1800 BJT, and 2300–2400 BJT were observed. During three periods, the raindrops had wider size spectra, higher number concentrations, larger rain rates, and higher water contents than at other times. The hydrometeor type, size, and concentration were gradually changed in the vertical orientation. The raindrop size distributions of warm precipitation in the air and on the ground were different, which can be expressed by γ distributions N(D) = 1.49 × 104D−0.9484exp(−6.79D) in the air and N(D) = 1.875 × 103D0.862exp(−2.444D) on the ground, where D and N(D) denote the diameter and number concentration of the raindrops, respectively.

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