However, what controls the long-term variability of the SWW at the high latitudes of the SH is still a matter of debate. Moreover, during the past few decades, the westerlies have shown an increase in their core strength influenced by changes in the Southern Annular Mode (SAM). This wind belt also varies at interannual-to-decadal time scales, associated with the influence of atmospheric phenomena such as the El Niño–Southern Oscillation (ENSO) and the Pacific Decadal Oscillation (PDO), respectively. The present-day behavior of the SWW, also known as westerlies, is characterized by remarkable seasonality. In Patagonia, these winds control the precipitation rates at the windward side of the southern Andes, and rainfall is very sensitive to any change (strength and/or latitudinal position) in the wind belt. PDFSam will create a new PDF file that contains all the pages from the PDF file you specified.The Southern Westerly Wind (SWW) belt is one of the most important atmospheric features of the Southern Hemisphere (SH). Use the Browse button to specify the destination of a new PDF file and click Run. You can reorder them in the list so they’re in the order you want them in. Once in the Merge/Extract pane, click the Add button and add the PDFs you want to merge. You’d click the Merge/Extract plugin in the sidebar. Let’s say you want to combine multiple PDFs into one file, attaching each PDF after the other as if you’re virtually stapling them together. Merging PDFsĪdmittedly, PDFSam’s interface is a bit clunky and dated, but it works fine once you get the hang of it. If you want to do some basic PDF splitting, merging, and reordering, PDFSam is the application for you. I’ve personally used PDFSam to combine multiple documents scanned to PDF into a single file, reorder pages in a scanned PDF, and extract a single important page from a large, unwieldy PDF document. These operations aren’t normally possible with such easy, free tools.
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