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

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  • Anoop S. Mahajan
  • Liselotte Tinel
  • Shrivardhan Hulswar
  • Carlos A. Cuevas
  • Shanshan Wang
  • Sachin Ghude
  • Ravidas K. Naik
  • Rajani K. Mishra
  • P. Sabu
  • Amit Sarkar
  • N. Anilkumar
  • Alfonso Saiz Lopez


Publication details

JournalAtmospheric Environment: X
DateAccepted/In press - 21 Jan 2019
DateE-pub ahead of print (current) - 29 Jan 2019
Number of pages10
Pages (from-to)1-10
Early online date29/01/19
Original languageEnglish


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 I2 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.

Bibliographical note

2019 The Author(s). Published by Elsevier Ltd.

    Research areas

  • Halogens, Indian ocean, Iodine, Marine boundary layer, Ozone

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