Eastern Indian Ocean warming associated with the negative Indian Ocean dipole: A case study of the 2010 event

2013 ◽  
Vol 118 (1) ◽  
pp. 536-549 ◽  
Author(s):  
Takanori Horii ◽  
Iwao Ueki ◽  
Kentaro Ando ◽  
Keisuke Mizuno
Keyword(s):  
Indian Ocean ◽  
Indian Ocean Dipole ◽  
Ocean Warming ◽  
Eastern Indian Ocean ◽  
Indian Ocean Warming

scholarly journals The influence of tropical Indian Ocean warming and Indian Ocean Dipole on the surface chlorophyll concentration in the eastern Arabian Sea

2019 ◽  
Author(s):  
Syam Sankar ◽  
Anoop Thondithala Ramachandran ◽  
Kemgang Ghomsi Franck Eitel ◽  
Dmitry Kondrik ◽  
Radharani Sen ◽  
...  
Keyword(s):  
Indian Ocean ◽  
Indian Ocean Dipole ◽  
Arabian Sea ◽  
Coastal Upwelling ◽  
Chlorophyll Concentration ◽  
Ocean Warming ◽  
Oceanic Circulation ◽  
Western Basin ◽  
Indian Ocean Warming ◽  
Eastern Arabian Sea

Abstract. This study examines the role of increased Indian Ocean warming and positive Indian Ocean Dipole (IOD) events on the surface chlorophyll concentration in the Eastern Arabian Sea (EAS) during the period 1998 to 2014. Remotely sensed surface chlorophyll concentration – during the month of October when IOD strength is maximum – at three selected areas in the EAS, viz., the central eastern Arabian Sea (CEAS, 73° E–76° E, 13° N–18° N), south eastern Arabian Sea (SEAS, 74° E–77° E, 8° N–13° N) and the southern tip of India (TIP, 74° E–78° E, 5° N–8° N) shows a steady decreasing trend, though not statistically significant. The EAS also has a higher warming trend when compared to the western basin during the study period. Our analysis has shown that in the EAS, local surface winds, remote forcing by equatorial winds and the surface and sub-surface oceanic circulation features are less (respectively more) favorable for inducing coastal upwelling during positive (respectively negative) IOD years. The Dipole Mode Index (DMI) and surface chlorophyll concentration in the EAS is significantly and negatively correlated, pointing to the fact that in the event of occurrence of frequent positive IOD years under a global warming regime, the surface chlorophyll concentration is likely to decrease during fall.

scholarly journals A New Type of the Indian Ocean Dipole since the Mid-1970s

2013 ◽  
Vol 26 (3) ◽  
pp. 959-972 ◽  
Author(s):  
Yan Du ◽  
Wenju Cai ◽  
Yanling Wu
Keyword(s):  
Indian Ocean ◽  
Indian Ocean Dipole ◽  
Climate Models ◽  
Tropical Indian Ocean ◽  
Ocean Warming ◽  
Peak Time ◽  
Austral Winter ◽  
Indian Ocean Warming ◽  
New Type ◽  
The Indian Ocean

Abstract The tropical Indian Ocean dipole/zonal mode (IOD) is phase locked with the austral winter and spring seasons. This study describes three types of the IOD in terms of their peak time and duration. In particular, the authors focus on a new type that develops in May–June and matures in July–August, which is distinctively different from the canonical IOD, which may develop later and peak in September–November or persist from June to November. Such “unseasonable” IOD events are only observed since the mid-1970s, a period after which the tropical Indian Ocean has a closer relationship with the Pacific Ocean. The unseasonable IOD is an intrinsic mode of the Indian Ocean and occurs without an ensuing El Niño. A change in winds along the equator is identified as a major forcing. The wind change is in turn related to a weakening Walker circulation in the Indian Ocean sector in austral winter, which is in part forced by the rapid Indian Ocean warming. Thus, although the occurrence of the unseasonable IOD may be partially influenced by oceanic variability, the authors’ results suggest an influence from the Indian Ocean warming. This suggestion, however, awaits further investigation using fully coupled climate models.

scholarly journals Impact of the Strong Downwelling (Upwelling) on Small Pelagic Fish Production during the 2016 (2019) Negative (Positive) Indian Ocean Dipole Events in the Eastern Indian Ocean off Java

Climate ◽  
2021 ◽  
Vol 9 (2) ◽  
pp. 29
Author(s):  
Jonson Lumban-Gaol ◽  
Eko Siswanto ◽  
Kedarnath Mahapatra ◽  
Nyoman Metta Nyanakumara Natih ◽  
I Wayan Nurjaya ◽  
...  
Keyword(s):  
Indian Ocean ◽  
Indian Ocean Dipole ◽  
Pelagic Fish ◽  
Eastern Indian Ocean ◽  
Fish Production ◽  
Small Pelagic Fish ◽  
Field Surveys ◽  
Chl A ◽  
Positive Indian Ocean Dipole ◽  
The Impact

Although researchers have investigated the impact of Indian Ocean Dipole (IOD) phases on human lives, only a few have examined such impacts on fisheries. In this study, we analyzed the influence of negative (positive) IOD phases on chlorophyll a (Chl-a) concentrations as an indicator of phytoplankton biomass and small pelagic fish production in the eastern Indian Ocean (EIO) off Java. We also conducted field surveys in the EIO off Palabuhanratu Bay at the peak (October) and the end (December) of the 2019 positive IOD phase. Our findings show that the Chl-a concentration had a strong and robust association with the 2016 (2019) negative (positive) IOD phases. The negative (positive) anomalous Chl-a concentration in the EIO off Java associated with the negative (positive) IOD phase induced strong downwelling (upwelling), leading to the preponderant decrease (increase) in small pelagic fish production in the EIO off Java.

scholarly journals Step Increase in Eastern U.S. Precipitation Linked to Indian Ocean Warming

2020 ◽  
Vol 47 (17) ◽  
Author(s):  
Courtenay Strong ◽  
Gregory J. McCabe ◽  
Alexander Weech
Keyword(s):  
Indian Ocean ◽  
Ocean Warming ◽  
Indian Ocean Warming

Why is Indian Ocean warming consistently?

2011 ◽  
Vol 110 (3-4) ◽  
pp. 709-719 ◽  
Author(s):  
Suryachandra A. Rao ◽  
Ashish R. Dhakate ◽  
Subodh K. Saha ◽  
Somnath Mahapatra ◽  
Hemantkumar S. Chaudhari ◽  
...  
Keyword(s):  
Indian Ocean ◽  
Ocean Warming ◽  
Indian Ocean Warming

Indo-Pacific climate during the decaying phase of the 2015/16 El Niño: role of southeast tropical Indian Ocean warming

2017 ◽  
Vol 50 (11-12) ◽  
pp. 4707-4719 ◽  
Author(s):  
Zesheng Chen ◽  
Yan Du ◽  
Zhiping Wen ◽  
Renguang Wu ◽  
Chunzai Wang
Keyword(s):  
Indian Ocean ◽  
El Niño ◽  
El Nino ◽  
Tropical Indian Ocean ◽  
Ocean Warming ◽  
Indian Ocean Warming

Twentieth century North Atlantic climate change. Part II: Understanding the effect of Indian Ocean warming

2004 ◽  
Vol 23 (3-4) ◽  
pp. 391-405 ◽  
Author(s):  
M. P. Hoerling ◽  
J. W. Hurrell ◽  
T. Xu ◽  
G. T. Bates ◽  
A. S. Phillips
Keyword(s):  
Climate Change ◽  
Twentieth Century ◽  
Indian Ocean ◽  
North Atlantic ◽  
Ocean Warming ◽  
Indian Ocean Warming ◽  
North Atlantic Climate
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