Related Experiment Video
Updated: Jun 22, 2026
10:28
Investigating the Relationship between Sea Surface Chlorophyll and Major Features of the South China Sea with Satellite Information
Published on: June 13, 2020
Coupled ocean-atmosphere dynamics in the Indian Ocean during 1997-98
P J Webster1, A M Moore, J P Loschnigg
1Program in Atmospheric and Oceanic Sciences, Campus Box 311, University of Colorado, Boulder, Colorado 80309-311, USA. pjw@oz.colorado.edu
Nature
|July 25, 2006
Summary
Indian Ocean climate variability may be driven by internal ocean-atmosphere dynamics, not just external events like El Niño/Southern Oscillation. This finding could improve climate predictions for the region.
Area of Science:
- Oceanography
- Atmospheric Science
- Climate Dynamics
Background:
- Indian Ocean climate variability exhibits characteristics seemingly independent of external forcings like El Niño/Southern Oscillation.
- The precise role and mechanisms of internal coupled ocean-atmosphere dynamics in shaping the Indian Ocean system remain unresolved.
Purpose of the Study:
- To analyze the 1997-98 seasonal anomalies in Indian Ocean sea surface temperatures, sea surface heights, precipitation, and winds.
- To compare these anomalies with 40 years of Indian Ocean climate variability data.
- To investigate the potential for internal dynamics to drive significant climate anomalies in the region.
Main Methods:
- Detailed analysis of sea surface temperatures, sea surface heights, precipitation, and wind data from 1997-98.
- Comparative analysis with historical Indian Ocean climate variability records spanning 40 years.
Main Results:
- The strong 1997-98 anomalies in the Indian Ocean, despite coinciding with a major El Niño/Southern Oscillation event, appear to be primarily driven by internal dynamics.
- A proposed mechanism of ocean-atmosphere interaction governing the 1997-98 event suggests a characteristic internal mode of the Indian Ocean climate system.
Conclusions:
- The 1997-98 Indian Ocean climate anomalies may represent an internal mode, distinct from direct responses to external influences.
- If this internal mode is robust, it holds potential for improving the predictability of Indian Ocean climate, similar to El Niño prediction in the Pacific.
Related Concept Videos
01:14The Carbon Cycle
Carbon is the basis of all organic matter on Earth, and is recycled through the ecosystem in two primary processes: one in which carbon is exchanged among living organisms, and one in which carbon is cycled over long periods of time through fossilized organic remains, weathering of rocks, and volcanic activity. Human activities, including increased agricultural practices and the burning of fossil fuels, has greatly affected the balance of the natural carbon cycle.
01:49The Nitrogen Cycle
Nitrogen atoms, present in all proteins and DNA, are recycled between abiotic and biotic components of the ecosystem. However, the primary form of nitrogen on Earth is nitrogen gas, which cannot be used by most animals and plants. Thus, nitrogen gas must first be converted into a usable form by nitrogen-fixing bacteria before it can be cycled through other living organisms. The use of nitrogen-containing fertilizers and animal waste products in human agriculture has greatly influenced the...
01:50Global Climate Change
Throughout its ~4.5 billion year history, the Earth has experienced periods of warming and cooling. However, the current drastic increase in global temperatures is well outside of the Earth’s cyclic norms, and evidence for human-caused global climate change is compelling. Paleoclimatology, the study of ancient climate conditions, provides ample evidence for human-caused global climate change by comparing recent conditions with those in the past.
01:30Marine Microbial Ecology
Marine microbial ecosystems are shaped by distinct physicochemical limits, including high salinity, low nutrient availability, and fluctuating oxygen levels. These conditions favor smaller microbial cell sizes, which maximize their surface-to-volume ratio for efficient nutrient uptake.Microbial activity and community composition are closely linked to biogeochemical cycles, particularly in dynamic environments like estuaries, where halotolerant microbes thrive in response to variable salinity...
01:18Deep Sea Microbial Ecology
The deep ocean and its underlying sediments represent vast, largely unexplored microbial habitats that extend far beyond the sunlit photic zone. The photic (euphotic) zone typically spans the upper ~100–200 meters of pelagic waters in the open ocean, but its depth varies geographically and seasonally, where sufficient light supports photosynthetic life. Below this lies the deep sea, spanning roughly 1000–6000 meters (bathypelagic to abyssal zones), with deeper hadal trenches extending beyond...
01:27Microbes and Climate Change
Microorganisms are pivotal agents in Earth's biogeochemical cycles, significantly influencing climate dynamics through their metabolic activities. These microbes modulate the levels of key greenhouse gases by both contributing to and helping mitigate climate change.Microbial Contributions to Greenhouse Gas EmissionsRising global temperatures accelerate microbial metabolism, which, in turn, speeds up the decomposition of organic matter. This process releases carbon dioxide (CO₂) through...