Nav: Home

Warm-sector heavy rainfall in China: Studies and challenges

December 05, 2019

Warm-sector heavy rainfall (WSHR) is a type of rainstorm proposed by Chinese meteorologists that had been found to only occur in South China. However, WSHR has also been found in other regions of China, according to Prof. Jianhua Sun from the Institute of Atmospheric Physics (IAP) of the Chinese Academy of Sciences.

"WSHR events often cause severe flooding, huge economic losses, and many casualties, but the operational prediction of these events is difficult and often inaccurate," says Prof. Sun. "To encourage more scientists to study this problem, we summarize existing researches and propose challenges presented by WSHR."

Prof. Sun and her team - a group of researchers from IAP, Beijing Municipal Weather Forecast Center, and China Meteorological Administration - reviewed research results on WSHR, including the categories and general features, the triggering mechanism, and structural features of the mesoscale convective system. Their study was published in Advances in Atmospheric Sciences (AAS) .

"After decades of research, we have a relatively deep understanding of the triggering mechanism and synoptic weather systems of WSHR in South China, but we only have a preliminary understanding of WSHR in other regions," said Prof. Sun.

WSHR events in South China are associated with four types of synoptic patterns (wind shear, a low vortex, southerly wind, and backflow), while those occurring in regions south of the Yangtze River and over the middle and lower reaches of the Yangtze River are associated with the synoptic patterns of a warm wind shear line, pre-cold front, and the edge of the western Pacific subtropical high.

The topography and land-sea contrast are important factors impacting the intensity and distribution of WHSR events in South China. However, the severe precipitation maxima in WSHR events of other regions in China are dispersed and occur over mountains, the borders of mountains and plains, and the shorelines of lakes.

WSHR events can also occur in North China, such as the extreme heavy rainfall case on July 21, 2012. Due to the lack of understanding of WSHR, forecasts of their occurrence are inaccurate and the forecast intensity is typically less than the actual precipitation record.

"Till now, forecasting WSHR has been very difficult because we do not fully understand the formation and developing mechanism," said Prof. Sun. "To improve the forecasting accuracy of heavy rainfall, the background conditions, triggering mechanism and predictability of WSHR in China are worthy of further study."
-end-


Institute of Atmospheric Physics, Chinese Academy of Sciences

Related Research Articles:

More Research News and Research Current Events

Trending Science News

Current Coronavirus (COVID-19) News

Top Science Podcasts

We have hand picked the top science podcasts of 2020.
Now Playing: TED Radio Hour

Teaching For Better Humans 2.0
More than test scores or good grades–what do kids need for the future? This hour, TED speakers explore how to help children grow into better humans, both during and after this time of crisis. Guests include educators Richard Culatta and Liz Kleinrock, psychologist Thomas Curran, and writer Jacqueline Woodson.
Now Playing: Science for the People

#556 The Power of Friendship
It's 2020 and times are tough. Maybe some of us are learning about social distancing the hard way. Maybe we just are all a little anxious. No matter what, we could probably use a friend. But what is a friend, exactly? And why do we need them so much? This week host Bethany Brookshire speaks with Lydia Denworth, author of the new book "Friendship: The Evolution, Biology, and Extraordinary Power of Life's Fundamental Bond". This episode is hosted by Bethany Brookshire, science writer from Science News.
Now Playing: Radiolab

Dispatch 3: Shared Immunity
More than a million people have caught Covid-19, and tens of thousands have died. But thousands more have survived and recovered. A week or so ago (aka, what feels like ten years in corona time) producer Molly Webster learned that many of those survivors possess a kind of superpower: antibodies trained to fight the virus. Not only that, they might be able to pass this power on to the people who are sick with corona, and still in the fight. Today we have the story of an experimental treatment that's popping up all over the country: convalescent plasma transfusion, a century-old procedure that some say may become one of our best weapons against this devastating, new disease.   If you have recovered from Covid-19 and want to donate plasma, national and local donation registries are gearing up to collect blood.  To sign up with the American Red Cross, a national organization that works in local communities, head here.  To find out more about the The National COVID-19 Convalescent Plasma Project, which we spoke about in our episode, including information on clinical trials or plasma donation projects in your community, go here.  And if you are in the greater New York City area, and want to donate convalescent plasma, head over to the New York Blood Center to sign up. Or, register with specific NYC hospitals here.   If you are sick with Covid-19, and are interested in participating in a clinical trial, or are looking for a plasma donor match, check in with your local hospital, university, or blood center for more; you can also find more information on trials at The National COVID-19 Convalescent Plasma Project. And lastly, Tatiana Prowell's tweet that tipped us off is here. This episode was reported by Molly Webster and produced by Pat Walters. Special thanks to Drs. Evan Bloch and Tim Byun, as well as the Albert Einstein College of Medicine.  Support Radiolab today at Radiolab.org/donate.