Open AccessCarbon Dioxide and Methane in the China Sea Shelf Boundary Layer Observed by Cavity Ring-Down Spectroscopy
Author(s) -
Kunpeng Zang,
Zhou Li-hua,
Juying Wu
Publication year - 2017
Publication title -
journal of atmospheric and oceanic technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.774
H-Index - 124
eISSN - 1520-0426
pISSN - 0739-0572
DOI - 10.1175/jtech-d-16-0217.1
Subject(s) - methane , carbon dioxide , mixing ratio , atmospheric sciences , cavity ring down spectroscopy , environmental science , monsoon , mixing (physics) , planetary boundary layer , sea surface temperature , boundary layer , mixed layer , trace gas , spectroscopy , oceanography , carbon dioxide in earth's atmosphere , climatology , geology , chemistry , physics , organic chemistry , quantum mechanics , thermodynamics
High-accuracy continuous ship-based cavity ring-down spectroscopy was used to simultaneously measure the mixing ratios of the carbon dioxide and methane in the China Sea shelf boundary layer for the first time, from 22 March to 2 April 2013. The mixing ratios of CO 2 and CH 4 ranged from 397.40 to 432.40 µ mol mol −1 and from 1812.8 to 2068.7 nmol mol −1 , respectively. Measurement data showed latitudinal distributions, with a slight fluctuation between 35.52° and 22.00°N but a sharp decline from 22.00° to 20.50°N. This distribution was not only the result of airmass transport from the Asian continent and Pacific Ocean induced by winter monsoon and trade winds but also by air–sea exchange and atmospheric chemical processes. Moreover, mixing ratios of CO 2 and CH 4 showed a temporal and spatial correlation that was possibly due to the effects of multisource air masses and their mixed status.