{"id":17328,"date":"2023-11-23T11:45:08","date_gmt":"2023-11-23T06:15:08","guid":{"rendered":"https:\/\/vajiramandravi.com\/current-affairs\/?p=17328"},"modified":"2025-04-05T03:36:29","modified_gmt":"2025-04-04T22:06:29","slug":"sam","status":"publish","type":"post","link":"https:\/\/vajiramandravi.com\/current-affairs\/sam\/","title":{"rendered":"What is Southern Annular Mode (SAM)?"},"content":{"rendered":"<h2>About Southern Annular Mode<\/h2>\n<ul>\n<li>It is the\u00a0north-south movement of Southern Westerly Winds over timescales of 10s to 100s of years.\u00a0<\/li>\n<li>It is also known as the\u00a0Antarctic Oscillation.<\/li>\n<li>They blow almost continuously in\u00a0the mid- to high-latitudes of the southern hemisphere.<\/li>\n<li>It is usually defined as the difference in the zonal mean\u00a0sea level pressure at 40\u00b0S (mid-latitudes) and\u00a065\u00b0S (Antarctica).<\/li>\n<li>Positive Southern Annular Mode\n<ul>\n<li>In this mode, there is\u00a0lower anomalous air pressure over Antarctica and higher anomalous air pressure over the\u00a0mid-latitudes.<\/li>\n<li>The belt of strong westerly winds\u00a0strengthens and contracts towards Antarctica.<\/li>\n<\/ul>\n<\/li>\n<li>Negative Southern Annular Mode\n<ul>\n<li>In this mode the belt of strong Southern Westerly Winds\u00a0expands northwards towards the equator, bringing cold, wet weather to Patagonia and glacier advance, and decreased Circumpolar Deep Water upwelling on the Antarctic Continental Shelf.\u00a0<\/li>\n<\/ul>\n<\/li>\n<li>Significance\n<ul>\n<li>The study contributes to\u00a0advancing the accuracy of wave predictions and can help identify fair weather windows.<\/li>\n<li>It will\u00a0benefit the fisher folk community and\u00a0blue economy stake holders such as shipping, maritime boards and oil industry for their multi-million dollars worth operations at sea.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<hr \/>\n<h3>Q1) What are westerlies?<\/h3>\n<p>The westerly winds, also known as the westerlies, occur at two regions on Earth: between 30 and 60 degrees latitude in the northern hemisphere and between 30 and 60 degrees latitude in the southern hemisphere. The name of these unique winds comes from the direction of their origin; the westerlies run west to east while other winds run east to west.<\/p>\n<p><strong>Source: <\/strong><a href=\"https:\/\/www.thehindu.com\/news\/national\/telangana\/incois-sam-study-to-understand-fair-weather-patterns-on-seas-for-maritime-activities\/article67550750.ece\" target=\"_blank\" rel=\"nofollow noopener\">INCOIS \u2018SAM\u2019 study to understand fair weather patterns on seas for maritime activities<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Southern Annular Mode is the north-south movement of Southern Westerly Winds over timescales of 10s to 100s of years. <\/p>\n","protected":false},"author":5,"featured_media":17329,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[1],"tags":[],"class_list":{"0":"post-17328","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-upsc-prelims-current-affairs","8":"no-featured-image-padding"},"acf":[],"_links":{"self":[{"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/posts\/17328","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/users\/5"}],"replies":[{"embeddable":true,"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/comments?post=17328"}],"version-history":[{"count":0,"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/posts\/17328\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/media\/17329"}],"wp:attachment":[{"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/media?parent=17328"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/categories?post=17328"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/tags?post=17328"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}