Observations of iodine oxide in the Indian Ocean marine boundary layer: A transect from the tropics to the high latitudes

Observations of iodine oxide (IO) were made in the Indian Ocean and the Southern Ocean marine boundary layer (MBL) during the 8th Indian Southern Ocean Expedition. IO was observed almost ubiquitously in the open ocean with larger mixing ratios south of the Polar Front (PF). Contrary to previous repo...

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Bibliographic Details
Published in:Atmospheric Environment: X
Main Authors: Mahajan, Anoop, Tinel, Liselotte, Hulswar, Shrivardhan, Cuevas, Carlos, Wang, Shanshan, Ghude, Sachin, Naik, Ravidas, Mishra, Rajani, Sabu, P., Sarkar, Amit, Anilkumar, N., Saiz Lopez, Alfonso
Other Authors: Indian Institute of Tropical Meteorology (IITM), University of York York, UK, Goa University, Instituto de Química Física Rocasolano (IQFR), Consejo Superior de Investigaciones Científicas Madrid (CSIC)
Format: Article in Journal/Newspaper
Language:English
Published: HAL CCSD 2019
Subjects:
Halogens
Indian ocean
Ozone
Marine boundary layer
Iodine
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean
Atmosphere
Indian
Southern Ocean
Online Access:https://hal.science/hal-04146145
https://hal.science/hal-04146145/document
https://hal.science/hal-04146145/file/1-s2.0-S259016211930019X-main.pdf
https://doi.org/10.1016/j.aeaoa.2019.100016
Description
Summary:Observations of iodine oxide (IO) were made in the Indian Ocean and the Southern Ocean marine boundary layer (MBL) during the 8th Indian Southern Ocean Expedition. IO was observed almost ubiquitously in the open ocean with larger mixing ratios south of the Polar Front (PF). Contrary to previous reports, IO was not positively correlated to sea surface temperature (SST)/salinity, or negatively to chlorophyll a. Over the whole expedition, SST showed a weak negative correlation with respect to IO while chl a was positively correlated. North of the PF, chl a showed a strong positive correlation with IO. The computed HOI and I 2 fluxes do not show any significant correlation with atmospheric IO. Simulations with the global CAM-Chem model show a reasonably good agreement with observations north of the PF but the model fails to reproduce the elevated IO south of the PF indicating that the current emission parametrizations are not sufficient to explain iodine chemistry in the Southern Indian Ocean.

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