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Continuous Isoprene Measurements in a UK Temperate Forest for a Whole Growing Season: Effects of Drought Stress During the 2018 Heatwave
Author(s) -
Ferracci Valerio,
Bolas Conor G.,
Freshwater Ray A.,
Staniaszek Zosia,
King Thomas,
Jaars Kerneels,
OtuLarbi Frederick,
Beale John,
Malhi Yadvinder,
Waine Toby William,
Jones Roderic L.,
Ashworth Kirsti,
Harris Neil R. P.
Publication year - 2020
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2020gl088885
Subject(s) - isoprene , photosynthetically active radiation , environmental science , temperate climate , atmospheric sciences , temperate forest , canopy , temperate rainforest , ecosystem , drought stress , vegetation (pathology) , growing season , photosynthesis , ecology , botany , chemistry , biology , medicine , organic chemistry , pathology , copolymer , geology , polymer
Isoprene concentrations were measured at four heights below, within, and above the forest canopy in Wytham Woods (United Kingdom) throughout the summer of 2018 using custom‐built gas chromatographs (the iDirac). These observations were complemented with selected ancillary variables, including air temperature, photosynthetically active radiation, occasional leaf gas exchange measurements, and satellite retrievals of normalized difference vegetation and water indices. The campaign overlapped with a long and uninterrupted heatwave accompanied by moderate drought. Peak isoprene concentrations during the heatwave‐drought were up to a factor of 4 higher than those before or after. Higher temperatures during the heatwave could not account for all the observed isoprene; the enhanced abundances correlated with drought stress. Leaf‐level emissions confirmed this and also included compounds associated with ecosystem stress. This work highlights that a more in‐depth understanding of the effects of drought stress is required to better characterize isoprene emissions.