Research @ CRL

Recent Updates

1. Roxy Mathew Koll has been selected as a Lead Author of the IPCC Special Report on the Ocean and Cryosphere in a Changing Climate (SROCC). The Intergovernmental Panel on Climate Change (IPCC) provide regular assessments for policymakers of the scientific, technical and socio-economic aspects relating to climate change. In the SROCC, Roxy will be dealing with a chapter on extremes and abrupt changes in the ocean, and managing the risks. [News in the Indian Express] [IPCC Author List]

IOGOOS/IOP/SIBER/IRF/IIOE-2 Meeting and Bio-Argo Workshop2. The Indian Ocean Observing System (IndOOS) data is used in addressing societal and economic needs, in weather and seasonal climate forecasting and in the production of routine ocean-maps, re-analyses and predictions. Along with US, Japan, Australia and other countries, India is a major stakeholder in implementing the Indian Ocean observing systems. The major challenge for IndOOS at this time is to find and focus the resources of individual nations to achieve a coherent completion of the IndOOS plan, in particular to sustain the observing system and to build capacity to enable participating agencies to assimilate this data into operational forecasting models. In order to achieve this, an IndOOS Review meeting was hosted by UNESCO – Intergovernmental Oceanographic Commission (IOC) at Perth, Australia in Feb 2017. From IITM, Roxy Mathew Koll and R. R. Rao contributed in preparing a plan and white paper report for the IndOOS Review. [CLIVAR Indian Ocean Panel]

IMS Young Scientist Award in Tropical Meteorology to Dr. Roxy Mathew Koll, handed over by the Minister of Petroleum and Natural Gas, Dharmendra Pradhan3. Roxy Mathew Koll was felicitated with the Young Scientist Award of the Indian Meteorological Society. The award was handed over by the Minister of Petroleum and Natural Gas, Dharmendra Pradhan at the TROPMET 2016 conference in Bhubaneshwar. [News in Malayala ManoramaDeepika]

CHANSE IGP meet4. CHANSE project kick-off at IIT Bombay, Sep 2016. Coupled Human And Natural Systems Environment (CHANSE) is an Indo-UK project on water management under uncertainty in the Indo-Gangetic Plain. With collaborators in India and the UK, and support from the Ministry of Earth Sciences (MoES) and Natural Environment Research Council (NERC), the project aims to improve environmental conditions and well being for local people by engaging farmers and regulators in managing water systems sustainably. [project]

5. Sport Fishing Magazine article highlights our research on Indian Ocean warming and its impact on the marine ecosystem and the tuna—Turning up the heat, Jul 2016 [article]

6. An article in Science shows how the foraging habits of Frigate birds may be affected by the declining marine primary productivity and tuna in the Indian Ocean, as pointed out in our research, 1 Jul 2016

7. The Outlook Magazine interview on Monsoon Droughts—Get ready for more droughts, 27 Apr 2016.

8. highlights our research on Indian Ocean warming and its impacts, 19 Mar 2016.

Monsoon drought interview on Frontline Magazine9. The Frontline Magazine interview on Monsoon Droughts—We need to be prepared to adjust to drier conditions, 4 Mar 2016.

10. Roxy Mathew Koll has been selected as a member of the CLIVAR Indian Ocean Region Panel for the period 2016-2018. The CLIVAR Panel provides scientific and technical oversight for implementation of the sustained ocean observing system for the Indian Ocean and coordinates research on the role of the Indian Ocean on the climate system.

11. Roxy Mathew Koll has been named as a Kavli Fellow of the U.S. National Academy of Sciences [NAS].  Kavli fellows are selected by the members of the National Academy of Sciences. Since its inception in 1989, more than one hundred seventy five of its “alumni” have been elected to the National Academy of Sciences, and ten have received Nobel Prizes.

Marine Phytoplankton in a rapidly warming Indian Ocean
Marine Phytoplankton in a warming Indian OceanIndian Ocean warming and a reduction in marine phytoplankton Marine phytoplankton, which constitutes half of the global net primary production, are the microscopic plants in the ocean. Over the tropical oceans, the western Indian Ocean hosts one of the largest concentration of phytoplankton blooms in summer. Interestingly, this is the region which exhibits the largest ocean surface warming. Earlier studies, which faced a roadblock due to data unavailability, indicated an increase in phytoplankton over this area. However, our study using extended satellite data and model historical simulations indicate a long-term decline due to the rapid warming in the Indian Ocean.
Warm Ocean, Weak Monsoon
Land-sea thermal contrast and a normal monsoonWarm Ocean, Weak Monsoon
Land-sea temperature difference is a major force behind driving the monsoon circulation. Studies have shown that with increased greenhouse gases, land is warming faster than the ocean. However, we find that the scenario is different for the South Asian domain… here the ocean is warming at a rapid pace, with the land left behind in the race…
Indian Ocean warming, the bigger picture
Indian Ocean warmingAmong the major oceans, Indian Ocean is the smallest, and the warmest. Recent research finds that Indian Ocean also sustains the fastest warming rates among these oceans, entitling itself as a major contributor to the global ocean surface warming. The curious case of Indian Ocean warming, which had remained a chicken-egg problem, is brought to spotlight.
Tropical ocean-atmospheric coupling associated with the monsoon intraseasonal variability
ocean-atmospheric coupling associated with the monsoon intraseasonal oscillationsThe top 2-3m of the ocean holds as much heat as the whole atmosphere above it. Though changes in the atmosphere tend to be quicker than the ocean, the surface ocean also displays strong variability in short timescales. Our analysis shows that this variability of sea surface temperature (SST) and surface ocean dynamics has a larger role on the active and break spells of the South Asian monsoon—than that was thought before. The air-sea interaction processes from an ocean perspective is explored in this study.
SST-precipitation relationship over the monsoon basins, in a changing climate
SST-rainfall relationship over the tropical oceans and the monsoon domainSea surface temperature (SST) can be considered as the single representative quantity of the ocean, which communicates the ocean’s thermal inertia to the atmosphere, through an exchange of the surface fluxes. Our understanding of the atmospheric response, especially that of the rainfall, has been paradoxical. Here we explore the relationship between these two.