The Role of Oceanic Processes in the Initiation of Boreal Winter Intraseasonal Oscillations Over the Indian Ocean

2020 ◽  
Vol 125 (2) ◽  
Author(s):  
B. Jason West ◽  
Weiqing Han ◽  
Lei Zhang ◽  
Yuanlong Li
Keyword(s):  
Indian Ocean ◽  
Boreal Winter ◽  
Intraseasonal Oscillations ◽  
The Indian Ocean

scholarly journals Dynamics of the Intraseasonal Oscillations in the Indian Ocean South Equatorial Current

2008 ◽  
Vol 38 (1) ◽  
pp. 121-132 ◽  
Author(s):  
Lei Zhou ◽  
Raghu Murtugudde ◽  
Markus Jochum
Keyword(s):  
Indian Ocean ◽  
Baroclinic Instability ◽  
Phase Speed ◽  
Boreal Winter ◽  
Temporal Features ◽  
Intraseasonal Oscillations ◽  
Main Driver ◽  
The Indian Ocean ◽  
Equatorial Current ◽  
Southwestern Indian Ocean

Abstract The spatial and temporal features of intraseasonal oscillations in the southwestern Indian Ocean are studied by analyzing model simulations for the Indo-Pacific region. The intraseasonal oscillations have periods of 40–80 days with a wavelength of ∼650 km. They originate from the southeastern Indian Ocean and propagate westward as Rossby waves with a phase speed of ∼25 cm s−1 in boreal winter and spring. The baroclinic instability is the main driver for these intraseasonal oscillations. The first baroclinic mode dominates during most of the year, but during boreal winter and spring the second mode contributes significantly and often equally. Consequently, the intraseasonal oscillations are relatively strong in boreal winter and spring. Whether the atmospheric intraseasonal oscillations are also important for forcing the oceanic intraseasonal oscillations in the southwestern Indian Ocean needs further investigation.

THE ROLE OF EDUCATION ON DISASTER PREPAREDNESS CASE STUDY OF 2012 INDIAN OCEAN EARTHQUAKES ON THAILAND’S

2018 ◽  
Author(s):  
Raya Muttarak ◽  
Wiraporn Pothisiri
Keyword(s):  
Indian Ocean ◽  
Emergency Preparedness ◽  
Disaster Preparedness ◽  
Formal Education ◽  
Disaster Experience ◽  
Individual Household ◽  
The Indian Ocean ◽  
The Individual

In this paper we investigate how well residents of the Andaman coast in Phang Nga province, Thailand, are prepared for earthquakes and tsunami. It is hypothesized that formal education can promote disaster preparedness because education enhances individual cognitive and learning skills, as well as access to information. A survey was conducted of 557 households in the areas that received tsunami warnings following the Indian Ocean earthquakes on 11 April 2012. Interviews were carried out during the period of numerous aftershocks, which put residents in the region on high alert. The respondents were asked what emergency preparedness measures they had taken following the 11 April earthquakes. Using the partial proportional odds model, the paper investigates determinants of personal disaster preparedness measured as the number of preparedness actions taken. Controlling for village effects, we find that formal education, measured at the individual, household, and community levels, has a positive relationship with taking preparedness measures. For the survey group without past disaster experience, the education level of household members is positively related to disaster preparedness. The findings also show that disaster related training is most effective for individuals with high educational attainment. Furthermore, living in a community with a higher proportion of women who have at least a secondary education increases the likelihood of disaster preparedness. In conclusion, we found that formal education can increase disaster preparedness and reduce vulnerability to natural hazards.

scholarly journals Importance of seasonally resolved oceanic emissions for bromoform delivery from the tropical Indian Ocean and west Pacific to the stratosphere

2018 ◽  
Vol 18 (16) ◽  
pp. 11973-11990 ◽  
Author(s):  
Alina Fiehn ◽  
Birgit Quack ◽  
Irene Stemmler ◽  
Franziska Ziska ◽  
Kirstin Krüger
Keyword(s):  
Indian Ocean ◽  
Summer Monsoon ◽  
Tropical Indian Ocean ◽  
Boreal Summer ◽  
Boreal Winter ◽  
The West ◽  
West Pacific ◽  
Mixing Ratios ◽  
The Indian Ocean ◽  
Oceanic Emissions

Abstract. Oceanic very short-lived substances (VSLSs), such as bromoform (CHBr3), contribute to stratospheric halogen loading and, thus, to ozone depletion. However, the amount, timing, and region of bromine delivery to the stratosphere through one of the main entrance gates, the Indian summer monsoon circulation, are still uncertain. In this study, we created two bromoform emission inventories with monthly resolution for the tropical Indian Ocean and west Pacific based on new in situ bromoform measurements and novel ocean biogeochemistry modeling. The mass transport and atmospheric mixing ratios of bromoform were modeled for the year 2014 with the particle dispersion model FLEXPART driven by ERA-Interim reanalysis. We compare results between two emission scenarios: (1) monthly averaged and (2) annually averaged emissions. Both simulations reproduce the atmospheric distribution of bromoform from ship- and aircraft-based observations in the boundary layer and upper troposphere above the Indian Ocean reasonably well. Using monthly resolved emissions, the main oceanic source regions for the stratosphere include the Arabian Sea and Bay of Bengal in boreal summer and the tropical west Pacific Ocean in boreal winter. The main stratospheric injection in boreal summer occurs over the southern tip of India associated with the high local oceanic sources and strong convection of the summer monsoon. In boreal winter more bromoform is entrained over the west Pacific than over the Indian Ocean. The annually averaged stratospheric injection of bromoform is in the same range whether using monthly averaged or annually averaged emissions in our Lagrangian calculations. However, monthly averaged emissions result in the highest mixing ratios within the Asian monsoon anticyclone in boreal summer and above the central Indian Ocean in boreal winter, while annually averaged emissions display a maximum above the west Indian Ocean in boreal spring. In the Asian summer monsoon anticyclone bromoform atmospheric mixing ratios vary by up to 50 % between using monthly averaged and annually averaged oceanic emissions. Our results underline that the seasonal and regional stratospheric bromine injection from the tropical Indian Ocean and west Pacific critically depend on the seasonality and spatial distribution of the VSLS emissions.

A Secret People of South Asia. The Origins, Evolution and Role of the Luso-Indian Goan Community from the Sixteenth to Twentieth Centuries

Itinerario ◽  
1987 ◽  
Vol 11 (2) ◽  
pp. 72-86 ◽  
Author(s):  
Kenneth McPherson
Keyword(s):  
Indian Ocean ◽  
South Asia ◽  
Indian Ocean Region ◽  
Imperial Expansion ◽  
Ocean Region ◽  
The Indian Ocean

Until fairly recently, histories of European imperial expansion in the Indian Ocean region have been written largely in terms of the endeavours of Europeans in creating and controlling empire. Only in the last couple of decades has recognition been given slowly to the role of the indigenous economic and political compradors, both large and small, who were vital to the evolution and sustenance of European colonial empires.

Kinship as Politics

2017 ◽  
Author(s):  
Danna Agmon
Keyword(s):  
Indian Ocean ◽  
French Empire ◽  
Family Networks ◽  
Commercial Networks ◽  
The Indian Ocean ◽  
Kinship Ties ◽  
The Relationship

This chapter considers the role of family networks, both French and Tamil, in the development of French empire in India. It charts how two Tamil dynasties drew on their kinship ties to create commercial networks that spanned the Indian Ocean, and highlights the involvement of of one local woman in the relationship between French colonists and local familial institutions.

Indonesia and the Arab World, Then and Now

2021 ◽  
pp. 26-55
Author(s):  
Mirjam Lücking
Keyword(s):  
Middle East ◽  
Indian Ocean ◽  
Arab World ◽  
Seventh Century ◽  
Religious Leaders ◽  
Historical Overview ◽  
Islamic Culture ◽  
The Indian Ocean ◽  
The Relationship

This chapter provides a historical overview of ambivalent encounters between Indonesia and the Arab world through findings that show the relationship between Indonesia and the Middle East. It recounts the Indonesians' earliest encounters with Arab traders in the seventh century, from confrontations with Indo Persian Sufi up to the current democratization process that have been marked by contradictory dynamics. It also explains how Arabs have been acknowledged as teachers of Islam and allies in the postcolonial nonbloc movement. The chapter describes the gloomy counterimage of the Arab world against which Indonesian officials and religious leaders drew the picture of a tolerant, pluralist Indonesian Islam. It mentions the key role of the mobility across the Indian Ocean in the formation of Islamic culture in Indonesia.

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