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Oxidants in the marine troposphere: H 2 O 2 and O 3 over the western Atlantic Ocean
Author(s) -
Ray John D.,
Van Valin Charles C.,
Luria Menachem,
Boatman Joe F.
Publication year - 1990
Publication title -
global biogeochemical cycles
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.512
H-Index - 187
eISSN - 1944-9224
pISSN - 0886-6236
DOI - 10.1029/gb004i002p00201
Subject(s) - troposphere , oceanography , altitude (triangle) , latitude , submarine pipeline , environmental science , subtropics , sea level , atmospheric sciences , climatology , geology , geometry , mathematics , geodesy , fishery , biology
Measurements of tropospheric H 2 O 2 and O 3 concentrations were made over the Atlantic Ocean near the U.S. east coast (southeast of Newport News, Virginia) and near Bermuda during July 1988 with an instrumented aircraft. Oxidant concentrations were high (O 3 up to 100 parts per billion by volume (ppbv) and H 2 O 2 up to 2.5 ppbv) near the U.S. east coast at low altitude but decreased rapidly with increasing offshore distance to concentrations comparable to those measured near Bermuda. O 3 concentrations observed near Bermuda at low altitude were 14–22 ppbv, comparable to those reported for remote subtropical marine locations. O 3 concentrations increased with altitude (up to 2.6 km); high‐altitude concentrations were 30–80 ppbv. H 2 O 2 concentrations near Bermuda varied by a factor of 2, 0.7–1.5 ppbv, from day to day, but were nearly constant at all altitudes during individual flights. Because a high‐pressure system centered over the western Atlantic Ocean limited eastward advection of continental air toward Bermuda, these concentrations are assumed to be typical of mid‐latitude marine air during summer.