The effect of IOD on tropical cyclone activity in the South Indian Ocean: [Essay Example], 541 words GradesFixer
close
This essay has been submitted by a student. This is not an example of the work written by professional essay writers.

The Effect of Iod on Tropical Cyclone Activity in the South Indian Ocean

downloadDownload printPrint

Pssst… we can write an original essay just for you.

Any subject. Any type of essay.

We’ll even meet a 3-hour deadline.

Get your price

121 writers online

blank-ico
Download PDF

Based on 1979-2012 TC track datasets from the JTWC, TC tracks in South Indian Ocean were interpolated to grid boxes of 2.5° longitude by 2.5° latitude for attaining TC occurrence frequency datasets. This paper analyzes the effect of IOD on tropical cyclone activity in the South Indian Ocean. Tropical cyclone activities over the South Indian Ocean are closely related to IOD SST anomalies. Due to the effect of IOD (Positive minus Negative), the difference between the positive and negative IOD (Normal) years of TC genesis showed the east-west dipole pattern of TC genesis. TCs increase in the western half of the SIO (west of 70°E) and decrease in the eastern half of the SIO (east of 70°E). While for the difference between Negative IOD and Normal of TC genesis showed also the east-west dipole pattern of TC genesis but with TCs increase in the east of 95°E of SIO and decrease in the west of 95°E of SIO. The IOD-TC genesis relation is supported by evident decrease in OLR in the central west (southeast) tropical SIO during Positive (Negative) IOD periods. Tropical cyclones formation is also affected by large scale circulation changes. During the Positive IOD periods, there is anticyclonic (cyclonic) circulation anomalies in the eastern part of the South Indian Ocean and cyclonic (anticyclonic) anomalies in the central west of South Indian Ocean. Also there is cyclonic vorticity anomaly, large relative humidity, and rising/ascending motion in the same position that both contribute to the formation of tropical cyclones in the central west of SIO and in the Mozambique Channel while in the eastern South Indian Ocean there is low relative humidity, anticyclonic vorticity anomaly, sinking motion and large vertical zonal wind shear that inhibit tropical cyclone formation and vice versa during Negative IOD period. Therefore positive IOD event influences more TCs genesis in the central west of SIO and in the Mozambique Channel while Negative IOD event influences more TCs genesis in the South east of SIO.

Pssst... we can write an original essay just for you

Any subject. Any type of essay.

We’ll even meet a 3-hour deadline.

121 writers online

The spatial differences in TC paths between Positive IOD and Negative IOD indicate a significant decrease in TC activity in the southeastern part of Madagascar (45°-55°E), with a slight increase in TC activity in the mid-latitudes of the SIO (55°-70°E) and a decrease in TC activity in the eastern part of the SIO (75°-105°E) .This may be due to the fact that the vertical wind shear in the eastern part of Madagascar and in the eastern part of the SIO is relatively strong, with relatively low relative humidity and a sinking movement at 500 hPa, resulting in a decrease in the number of TC paths here. While the mid-latitudes in the SIO have strong convective activity, weak vertical wind shear and large relative humidity, leading to an increase in the number of tropical cyclone paths here. During positive IOD period, southwesterly winds in the southeast of Madagascar may hinder further westward spread of tropical cyclones. Subsequently, the tropical cyclone was guided by anomalous northwesterly winds between two large-scale vortices, then weakened in the midlatitude of the central South Indian Ocean. There are more TCs in the western half of South Indian Ocean (west of 75°E) during Positive IOD periods and more TCs in the south east of South Indian Ocean during Negative IOD periods.

infoRemember: This is just a sample from a fellow student.

Your time is important. Let us write you an essay from scratch

100% plagiarism-free

Sources and citations are provided

Find Free Essays

We provide you with original essay samples, perfect formatting and styling

Cite this Essay

To export a reference to this article please select a referencing style below:

The effect of IOD on tropical cyclone activity in the South Indian Ocean. (2018, October 26). GradesFixer. Retrieved April 21, 2021, from https://gradesfixer.com/free-essay-examples/the-effect-of-iod-on-tropical-cyclone-activity-in-the-south-indian-ocean/
“The effect of IOD on tropical cyclone activity in the South Indian Ocean.” GradesFixer, 26 Oct. 2018, gradesfixer.com/free-essay-examples/the-effect-of-iod-on-tropical-cyclone-activity-in-the-south-indian-ocean/
The effect of IOD on tropical cyclone activity in the South Indian Ocean. [online]. Available at: <https://gradesfixer.com/free-essay-examples/the-effect-of-iod-on-tropical-cyclone-activity-in-the-south-indian-ocean/> [Accessed 21 Apr. 2021].
The effect of IOD on tropical cyclone activity in the South Indian Ocean [Internet]. GradesFixer. 2018 Oct 26 [cited 2021 Apr 21]. Available from: https://gradesfixer.com/free-essay-examples/the-effect-of-iod-on-tropical-cyclone-activity-in-the-south-indian-ocean/
copy to clipboard
close

Sorry, copying is not allowed on our website. If you’d like this or any other sample, we’ll happily email it to you.

    By clicking “Send”, you agree to our Terms of service and Privacy statement. We will occasionally send you account related emails.

    close

    Attention! this essay is not unique. You can get 100% plagiarism FREE essay in 30sec

    Recieve 100% plagiarism-Free paper just for 4.99$ on email
    get unique paper
    *Public papers are open and may contain not unique content
    download public sample
    close

    Sorry, we cannot unicalize this essay. You can order Unique paper and our professionals Rewrite it for you

    close

    Thanks!

    Your essay sample has been sent.

    Want us to write one just for you? We can custom edit this essay into an original, 100% plagiarism free essay.

    thanks-icon Order now
    boy

    Hi there!

    Are you interested in getting a customized paper?

    Check it out!
    Having trouble finding the perfect essay? We’ve got you covered. Hire a writer

    GradesFixer.com uses cookies. By continuing we’ll assume you board with our cookie policy.

    exit-popup-close

    Haven't found the right essay?

    Get an expert to write you the one you need!

    exit-popup-print

    Professional writers and researchers

    exit-popup-quotes

    Sources and citation are provided

    exit-popup-clock

    3 hour delivery

    exit-popup-persone