Discovery on East Asian monsoon dynamics

August 28, 2018

In the online edition of Geophysical Research Letters, Dr Cheung Ching Wa Richard, Dr Moriaki Yasuhara, Dr Briony Mamo and Dr Hokuto Iwatani (from School of Biological Sciences and Swire Institute of Marine Science, The University of Hong Kong), in collaboration with scientists in Shimane University, Pusan National University, Korean Institute of Geoscience and Mineral Resources, Kyoto University, and Shinshu University, reported their discovery on East Asian monsoon dynamics over the past 1,000 years.

The East Asian summer monsoon (EASM) is a determining factor of regional precipitation in East Asia that subsequently affects socioeconomic activities of regional populations such as agriculture. However, spatial and time-series trends of decadal- to centennial-scale East Asian summer monsoon strength over the last millennium remain poorly understood and often show great inconsistency among records from various places of East Asian region, even with precisely dated Chinese cave stalagmite records. Dr Cheung, Dr Yasuhara and their collaborators identified four pervasive East Asian summer monsoon strengthening events at 1250, 1450, 1550, and 1900 CE and found that oceanic and continental settings could partially explain spatial differences in Asian summer monsoon trends at this scale. Ocean sediments may better directly record past East Asian Summer Monsoon signals than terrestrial records. In addition, they found that global ocean circulation may be weakened during these East Asian summer monsoon events. These findings help to better understand Asian monsoon dynamics in the past, present, and future in this rapidly changing planet.

The research group used fossil Foraminifera and Ostracoda preserved in a sediment core from the East Asian coast as model organisms to reconstruct the variability of the East Asian summer monsoon in the past, as these small (usually <1 mm) aquatic benthos are very sensitive to water conditions. the specimens were identified under microscope, and then standardized abundance of monsoon indicator species ( =indicative brackish condition due increased rain fall) computed. temporal variation records in this study showed striking similarity other east asian summer proxies asia.

"This project is based on the research conducted when I was an undergraduate student in the Environmental Science Major of the Faculty. I continued working on it during my PhD study. Asian Monsoon is very important for Asian society, culture, and agriculture, yet currently available proxies do not show consistent East Asian summer monsoon dynamic over the past millennium. Hopefully, the discovery in this project can generate deeper discussion regarding provincialism and teleconnection of Asian monsoon dynamics." said Dr Cheung.
-end-


The University of Hong Kong

Related Science Articles from Brightsurf:

75 science societies urge the education department to base Title IX sexual harassment regulations on evidence and science
The American Educational Research Association (AERA) and the American Association for the Advancement of Science (AAAS) today led 75 scientific societies in submitting comments on the US Department of Education's proposed changes to Title IX regulations.

Science/Science Careers' survey ranks top biotech, biopharma, and pharma employers
The Science and Science Careers' 2018 annual Top Employers Survey polled employees in the biotechnology, biopharmaceutical, pharmaceutical, and related industries to determine the 20 best employers in these industries as well as their driving characteristics.

Science in the palm of your hand: How citizen science transforms passive learners
Citizen science projects can engage even children who previously were not interested in science.

Applied science may yield more translational research publications than basic science
While translational research can happen at any stage of the research process, a recent investigation of behavioral and social science research awards granted by the NIH between 2008 and 2014 revealed that applied science yielded a higher volume of translational research publications than basic science, according to a study published May 9, 2018 in the open-access journal PLOS ONE by Xueying Han from the Science and Technology Policy Institute, USA, and colleagues.

Prominent academics, including Salk's Thomas Albright, call for more science in forensic science
Six scientists who recently served on the National Commission on Forensic Science are calling on the scientific community at large to advocate for increased research and financial support of forensic science as well as the introduction of empirical testing requirements to ensure the validity of outcomes.

World Science Forum 2017 Jordan issues Science for Peace Declaration
On behalf of the coordinating organizations responsible for delivering the World Science Forum Jordan, the concluding Science for Peace Declaration issued at the Dead Sea represents a global call for action to science and society to build a future that promises greater equality, security and opportunity for all, and in which science plays an increasingly prominent role as an enabler of fair and sustainable development.

PETA science group promotes animal-free science at society of toxicology conference
The PETA International Science Consortium Ltd. is presenting two posters on animal-free methods for testing inhalation toxicity at the 56th annual Society of Toxicology (SOT) meeting March 12 to 16, 2017, in Baltimore, Maryland.

Citizen Science in the Digital Age: Rhetoric, Science and Public Engagement
James Wynn's timely investigation highlights scientific studies grounded in publicly gathered data and probes the rhetoric these studies employ.

Science/Science Careers' survey ranks top biotech, pharma, and biopharma employers
The Science and Science Careers' 2016 annual Top Employers Survey polled employees in the biotechnology, biopharmaceutical, pharmaceutical, and related industries to determine the 20 best employers in these industries as well as their driving characteristics.

Three natural science professors win TJ Park Science Fellowship
Professor Jung-Min Kee (Department of Chemistry, UNIST), Professor Kyudong Choi (Department of Mathematical Sciences, UNIST), and Professor Kwanpyo Kim (Department of Physics, UNIST) are the recipients of the Cheong-Am (TJ Park) Science Fellowship of the year 2016.

Read More: Science News and Science Current Events
Brightsurf.com is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to Amazon.com.