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Extreme weather events recorded by daily to hourly resolution biogeochemical proxies of marine giant clam shells.

Journal Article


Abstract


  • Paleoclimate research has built a framework for Earth's climate changes over the past 65 million years or even longer. However, our knowledge of weather-timescale extreme events (WEEs, also named paleoweather), which usually occur over several days or hours, under different climate regimes is almost blank because current paleoclimatic records rarely provide information with temporal resolution shorter than monthly scale. Here we show that giant clam shells (Tridacna spp.) from the tropical western Pacific have clear daily growth bands, and several 2-y-long (from January 29, 2012 to December 9, 2013) daily to hourly resolution biological and geochemical records, including daily growth rate, hourly elements/Ca ratios, and fluorescence intensity, were obtained. We found that the pulsed changes of these ultra-high-resolution proxy records clearly matched with the typical instrumental WEEs, for example, tropical cyclones during the summer-autumn and cold surges during the winter. When a tropical cyclone passes through or approaches the sampling site, the growth rate of Tridacna shell decreases abruptly due to the bad weather. Meanwhile, enhanced vertical mixing brings nutrient-enriched subsurface water to the surface, resulting in a high Fe/Ca ratio and strong fluorescence intensity (induced by phytoplankton bloom) in the shell. Our results demonstrate that Tridacna shell has the potential to be used as an ultra-high-resolution archive for paleoweather reconstructions. The fossil shells living in different geological times can be built as a Geological Weather Station network to lengthen the modern instrumental data and investigate the WEEs under various climate conditions.

UOW Authors


  •   Dodson, John (external author)

Publication Date


  • 2020

Citation


  • Yan, H., Liu, C., An, Z., Yang, W., Yang, Y., Huang, P., . . . Zhou, W. (2020). Extreme weather events recorded by daily to hourly resolution biogeochemical proxies of marine giant clam shells.. Proceedings of the National Academy of Sciences of the United States of America, 117(13), 7038-7043. doi:10.1073/pnas.1916784117

Web Of Science Accession Number


Start Page


  • 7038

End Page


  • 7043

Volume


  • 117

Issue


  • 13

Abstract


  • Paleoclimate research has built a framework for Earth's climate changes over the past 65 million years or even longer. However, our knowledge of weather-timescale extreme events (WEEs, also named paleoweather), which usually occur over several days or hours, under different climate regimes is almost blank because current paleoclimatic records rarely provide information with temporal resolution shorter than monthly scale. Here we show that giant clam shells (Tridacna spp.) from the tropical western Pacific have clear daily growth bands, and several 2-y-long (from January 29, 2012 to December 9, 2013) daily to hourly resolution biological and geochemical records, including daily growth rate, hourly elements/Ca ratios, and fluorescence intensity, were obtained. We found that the pulsed changes of these ultra-high-resolution proxy records clearly matched with the typical instrumental WEEs, for example, tropical cyclones during the summer-autumn and cold surges during the winter. When a tropical cyclone passes through or approaches the sampling site, the growth rate of Tridacna shell decreases abruptly due to the bad weather. Meanwhile, enhanced vertical mixing brings nutrient-enriched subsurface water to the surface, resulting in a high Fe/Ca ratio and strong fluorescence intensity (induced by phytoplankton bloom) in the shell. Our results demonstrate that Tridacna shell has the potential to be used as an ultra-high-resolution archive for paleoweather reconstructions. The fossil shells living in different geological times can be built as a Geological Weather Station network to lengthen the modern instrumental data and investigate the WEEs under various climate conditions.

UOW Authors


  •   Dodson, John (external author)

Publication Date


  • 2020

Citation


  • Yan, H., Liu, C., An, Z., Yang, W., Yang, Y., Huang, P., . . . Zhou, W. (2020). Extreme weather events recorded by daily to hourly resolution biogeochemical proxies of marine giant clam shells.. Proceedings of the National Academy of Sciences of the United States of America, 117(13), 7038-7043. doi:10.1073/pnas.1916784117

Web Of Science Accession Number


Start Page


  • 7038

End Page


  • 7043

Volume


  • 117

Issue


  • 13