Menkès Christophe, Lengaigne Matthieu, Levy M., Ethe C., Bopp L., Aumont Olivier, Vincent E., Vialard Jérôme, Jullien S. (2016). Global impact of tropical cyclones on primary production. Global Biogeochemical Cycles, 30 (5), p. 767-786. ISSN 0886-6236.
Titre du document
Global impact of tropical cyclones on primary production
Année de publication
2016
Auteurs
Menkès Christophe, Lengaigne Matthieu, Levy M., Ethe C., Bopp L., Aumont Olivier, Vincent E., Vialard Jérôme, Jullien S.
Source
Global Biogeochemical Cycles, 2016,
30 (5), p. 767-786 ISSN 0886-6236
In this paper, we explore the global responses of surface temperature, chlorophyll, and primary production to tropical cyclones (TCs). Those ocean responses are first characterized from the statistical analysis of satellite data under similar to 1000 TCs over the 1998-2007 period. Besides the cold wake, the vast majority of TCs induce a weak chlorophyll response, with only similar to 10% of induced blooms exceeding 0.1 mg m(-3). The largest chlorophyll responses mostly occur within coastal regions, in contrast to the strongest cold wakes that generally occur farther offshore. To understand this decoupling, we analyze a coupled dynamical-biogeochemical oceanic simulation forced by realistic wind vortices applied along observed TC tracks. The simulation displays a realistic spatial structure of TC-induced blooms and its observed decoupling with TC cold wakes. In regions of strong TC energy input, the strongest cold wakes occur in regions of shallow thermocline (<60m) and the strongest blooms in regions of shallow nitracline and/or subsurface chlorophyll maximum (<60 m). Shallow thermoclines are found over many open ocean regions, while regions of shallow nitracline and/or subsurface chlorophyll maximum are most prominent in near-coastal areas, explaining the spatial decoupling between the cold and bloom wakes. The overall TC contribution to annual primary production is weak and amounts to similar to 1%, except in a few limited areas (east Eurasian coast, South tropical Indian Ocean, Northern Australian coast, and Eastern Pacific Ocean in the TC-prone region) where it can locally reach up to 20-30%. Nearly 80% of this TC-induced annual primary production is the result of the biogeochemical response to the 30% strongest TCs.
Plan de classement
Sciences fondamentales / Techniques d'analyse et de recherche [020]
;
Limnologie physique / Océanographie physique [032]
;
Ecologie, systèmes aquatiques [036]
;
Télédétection [126]
Description Géographique
ATLANTIQUE ; PACIFIQUE ; OCEAN INDIEN ; ZONE TROPICALE
Localisation
Fonds IRD [F B010067682]
Identifiant IRD
fdi:010067682
