Potential controls of isoprene in the surface ocean

TY - JOUR

T1 - Potential controls of isoprene in the surface ocean

AU - Hackenberg, Sina

AU - Andrews, Stephen Joseph

AU - Airs, R.

AU - Arnold, S. R.

AU - Bouman, Heather

AU - Brewin, R. J. W.

AU - Chance, Rosemary Jane

AU - Cummings, D.

AU - Dall'Olmo, G.

AU - Lewis, Alastair

AU - Minaeian, Jamie K

AU - Reifel, K. M.

AU - Small, A.

AU - Tarran, G. A.

AU - Tilstone, G. H.

AU - Carpenter, Lucy Jane

N1 - ©2017. The Authors

PY - 2017/4/11

Y1 - 2017/4/11

N2 - Isoprene surface ocean concentrations and vertical distribution, atmospheric mixing ratios, and calculated sea-to-air fluxes spanning approximately 125° of latitude (80°N–45°S) over the Arctic and Atlantic Oceans are reported. Oceanic isoprene concentrations were associated with a number of concurrently monitored biological variables including chlorophyll a (Chl a), photoprotective pigments, integrated primary production (intPP), and cyanobacterial cell counts, with higher isoprene concentrations relative to all respective variables found at sea surface temperatures greater than 20°C. The correlation between isoprene and the sum of photoprotective carotenoids, which is reported here for the first time, was the most consistent across all cruises. Parameterizations based on linear regression analyses of these relationships perform well for Arctic and Atlantic data, producing a better fit to observations than an existing Chl a-based parameterization. Global extrapolation of isoprene surface water concentrations using satellite-derived Chl a and intPP reproduced general trends in the in situ data and absolute values within a factor of 2 between 60% and 85%, depending on the data set and algorithm used.

AB - Isoprene surface ocean concentrations and vertical distribution, atmospheric mixing ratios, and calculated sea-to-air fluxes spanning approximately 125° of latitude (80°N–45°S) over the Arctic and Atlantic Oceans are reported. Oceanic isoprene concentrations were associated with a number of concurrently monitored biological variables including chlorophyll a (Chl a), photoprotective pigments, integrated primary production (intPP), and cyanobacterial cell counts, with higher isoprene concentrations relative to all respective variables found at sea surface temperatures greater than 20°C. The correlation between isoprene and the sum of photoprotective carotenoids, which is reported here for the first time, was the most consistent across all cruises. Parameterizations based on linear regression analyses of these relationships perform well for Arctic and Atlantic data, producing a better fit to observations than an existing Chl a-based parameterization. Global extrapolation of isoprene surface water concentrations using satellite-derived Chl a and intPP reproduced general trends in the in situ data and absolute values within a factor of 2 between 60% and 85%, depending on the data set and algorithm used.

U2 - 10.1002/2016GB005531

DO - 10.1002/2016GB005531

M3 - Article

SN - 0886-6236

VL - 31

SP - 644

EP - 662

JO - Global Biogeochemical Cycles

JF - Global Biogeochemical Cycles

IS - 4

M1 - GBC20531

ER -