English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

. We investigate the effect of variable marine biogeochemical lightabsorption on Indian Ocean sea surface temperature (SST) and how thisaffects the South Asian climate. In twin experiments with a regional Earthsystem model, we found that the average SST is lower over most of the domainwhen variable marine biogeochemical light absorption is taken into account,compared to the reference experiment with a constant light attenuationcoefficient equal to 0.06 m−1. The most significant deviations (more than1 ∘C) in SST are observed in the monsoon season. A considerablecooling of subsurface layers occurs, and the thermocline shifts upward inthe experiment with the activated biogeochemical impact. Also, thephytoplankton primary production becomes higher, especially during periodsof winter and summer phytoplankton blooms. The effect of altered SSTvariability on climate was investigated by coupling the ocean models to aregional atmosphere model. We find the largest effects on the amount ofprecipitation, particularly during the monsoon season. In the Arabian Sea,the reduction of the transport of humidity across the Equator leads to areduction of the large-scale precipitation in the eastern part of the basin,reinforcing the reduction of the convective precipitation. In the Bay ofBengal, it increases the large-scale precipitation, countering convectiveprecipitation decline. Thus, the key impacts of including the fullbiogeochemical coupling with corresponding light attenuation, which in turndepends on variable chlorophyll a concentration, include the enhancedphytoplankton primary production, a shallower thermocline, and decreased SST andwater temperature in subsurface layers, with cascading effects upon themodel ocean physics which further translates into altered atmospheredynamics.

Indian Ocean marine biogeochemical variability and its feedback on simulated South Asia climate