Surface CO2 system dynamics in the Gulf of Anadyr during the open water season

Highlights

  • Drivers and mechanisms responsible for the spatial variations in surface seawater CO2 system and associated air–sea CO2 fluxes for the Gulf of Anadyr are identified.
  • The decisive impact of the biological factor on the spatial variability of pCO2 in the surface waters during open water season is shown.
  • Calculated CO2 fluxes indicate the region is a large sink for atmospheric CO2 during open water season.

Abstract

The Gulf of Anadyr (GA), one of the largest and most poorly investigated gulfs of the Bering Sea, is an important part of the Pacific Arctic. Drivers and mechanisms responsible for the spatial variations in surface seawater CO2 system parameters and associated air–sea CO2 fluxes were investigated during three oceanographic cruises conducted in the GA during the open water season of 1992, 2002, and 2011. It was shown that the surface waters of the GA were moderate to strong sinks for atmospheric CO2 during this season: mean air-sea CO2 fluxes for the investigated areas of the GA, for the three cruises, were -31, -15, and -30 mmol CO2 m−2 d−1, respectively. The summer air-sea CO2 flux was attributed to intensive phytoplankton bloom, and fall CO2 uptake coincided with a period of strong winds and seasonal enhanced primary production. The surface waters of the GA were supersaturated with respect to aragonite during the investigated period. Anadyr Strait, a region of high hydrodynamic activity, was the only area where CO2 efflux was observed. Surface waters of the strait were supersaturated with respect to CO2 and in quasi-equilibrium with respect to aragonite. We found that during the late summer/fall season, the Anadyr Current exported a well-mixed, relatively cold, salty, nutrient- and CO2-rich water through the western Anadyr Strait into the Chirikov Basin. Our research highlights the need for mesoscale studies of the western Bering Sea to produce the most accurate assessment of the regional CO2 budget.

Pipko I. I., Pugach S. P., Luchin V. A., Francis O. P., Savelieva N. I., Charkin A. N., Dudarev O. V. & Semiletov I. P., in press. Surface CO2 system dynamics in the Gulf of Anadyr during the open water season. Continental Shelf Research. Article (subscription required).

0 Responses to “Surface CO2 system dynamics in the Gulf of Anadyr during the open water season”



  1. Leave a Comment

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out /  Change )

Google photo

You are commenting using your Google account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s

This site uses Akismet to reduce spam. Learn how your comment data is processed.




Subscribe to the RSS feed

Follow AnneMarin on Twitter

Archives

Powered by FeedBurner

Blog Stats

  • 1,451,106 hits

OA-ICC HIGHLIGHTS

Ocean acidification in the IPCC AR5 WG II

OUP book