{"id":48540,"date":"2018-06-03T12:10:32","date_gmt":"2018-06-03T12:10:32","guid":{"rendered":"http:\/\/www.climatemonitor.it\/?p=48540"},"modified":"2018-06-03T12:10:32","modified_gmt":"2018-06-03T12:10:32","slug":"se-siete-al-mare-misuratelo","status":"publish","type":"post","link":"https:\/\/www.climatemonitor.it\/?p=48540","title":{"rendered":"Se siete al mare misuratelo"},"content":{"rendered":"<p>E&#8217; probabile che in questa prima domenica di giugno le nostre spiagge siano affollate, sole e caldo non mancano e poi, per dirla tutta, la prossima potrebbe non essere altrettanto benevola, per cui meglio portarsi avanti col lavoro ;-).<\/p>\n<p>Comunque, naturalmente, non provateci sul serio a misurare il mare, perch\u00e9 non \u00e8 cos\u00ec che si stabilisce se il livello del mare sta cambiando. Semmai, doveste essere in un luogo che presenta delle scogliere, divertivi a guardare le linee che il mare ha scolpito nei secoli e nei millenni spesso diversi metri sopra il livello attuale, vi aiuter\u00e0 a ricordare che questo mondo ha da sempre la propensione al cambiamento, anche radicale.<\/p>\n<p>Quindi niente misura, perch\u00e9 per definire con buona approssimazione il livello del mare serve ben altro. Servono serie storiche stabili e solide e serve molta tecnologia. Le prime non le abbiamo, la seconda l&#8217;abbiamo solo da qualche decennio, per cui non vi stupir\u00e0 se, nonostante le proiezioni climatiche indichino che l&#8217;altezza del livello del mare \u00e8 uno dei pi\u00f9 preoccupanti effetti del riscaldamento globale di origine antropica e su questo si faccia anche grande speculazione, in realt\u00e0 distinguere la componente antropica da quella naturale nel trend del livello dei mari \u00e8 ad oggi molto ma molto difficile.<\/p>\n<p>Appena pochi giorni fa due noti commentatori che potremmo definire socialmente molto attivi ma di opinioni radicalmente diverse in ordine a questo argomento, si sono scambiati qualche tweet e, come spessissimo accade, ognuno dei due ha rafforzato la propria posizione, senza per\u00f2 giungere ad una soluzione (<a href=\"https:\/\/wattsupwiththat.com\/2018\/05\/the-climate-of-gavin\/\" target=\"_blank\" rel=\"noopener\">qui il riassunto e le coordinate<\/a>).<\/p>\n<p>Questo argomento dester\u00e0 l&#8217;attenzione di pi\u00f9 di uno dei nostri pi\u00f9 affezionati lettori, perci\u00f2 spero di farvi cosa gradita segnalando il posti con cui Roy Spencer, altro commentatore decisamente ben informato sui fatti, ha tentato di dirimere la questione, a mio modesto parere avvicinandosi non poco alla soluzione del problema.<\/p>\n<p><a href=\"http:\/\/www.drroyspencer.com\/2018\/05\/sea-level-rise-human-portion-is-small\/\" target=\"_blank\" rel=\"noopener\">Sea Level Rise: Human Portion is Small<\/a><\/p>\n<p>Qui sotto, il grafico realizzato con i dati oggetto della discussione e, sotto ancora, le considerazioni con cui si conclude il post, prese a prestito da qualcuno che di oceani se ne intende, l&#8217;oceanografo\u00a0<a href=\"https:\/\/en.wikipedia.org\/wiki\/Carl_Wunsch\" target=\"_blank\" rel=\"noopener\">Carl Wunsch<\/a>:<\/p>\n<figure id=\"attachment_48541\" aria-describedby=\"caption-attachment-48541\" style=\"width: 3000px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-48541\" src=\"http:\/\/www.climatemonitor.it\/wp-content\/uploads\/2018\/06\/Church-White-SLR-1880-2013.jpg\" alt=\"\" width=\"3000\" height=\"2250\" srcset=\"https:\/\/www.climatemonitor.it\/wp-content\/uploads\/2018\/06\/Church-White-SLR-1880-2013.jpg 3000w, https:\/\/www.climatemonitor.it\/wp-content\/uploads\/2018\/06\/Church-White-SLR-1880-2013-300x225.jpg 300w, https:\/\/www.climatemonitor.it\/wp-content\/uploads\/2018\/06\/Church-White-SLR-1880-2013-768x576.jpg 768w, https:\/\/www.climatemonitor.it\/wp-content\/uploads\/2018\/06\/Church-White-SLR-1880-2013-1024x768.jpg 1024w\" sizes=\"auto, (max-width: 3000px) 100vw, 3000px\" \/><figcaption id=\"caption-attachment-48541\" class=\"wp-caption-text\">Fonte: http:\/\/www.drroyspencer.com\/2018\/05\/sea-level-rise-human-portion-is-small\/<\/figcaption><\/figure>\n<blockquote><p><em>\u201cAt best, the determination and attribution of global-mean sea-level change lies at the very edge of knowledge and technology. Both systematic and random errors are of concern, the former particularly, because of the changes in technology and sampling methods over the many decades, the latter from the very great spatial and temporal variability. It remains possible that the database is insufficient to compute mean sea-level trends with the accuracy necessary to discuss the impact of global warming, as disappointing as this conclusion may be.\u201d<\/em><\/p><\/blockquote>\n<p>Buona domenica.<\/p>\n<p>&nbsp;<\/p>\n<div class=\"linkwithin_hook\" id=\"https:\/\/www.climatemonitor.it\/?p=48540\"><\/div><script>\n<!-- \/\/LinkWithinCodeStart\nvar linkwithin_site_id = 1804759;\nvar linkwithin_div_class = \"linkwithin_hook\";\n\/\/LinkWithinCodeEnd -->\n<\/script>\n<script src=\"http:\/\/www.linkwithin.com\/widget.js\"><\/script>\n<a href=\"http:\/\/www.linkwithin.com\/\"><img decoding=\"async\" src=\"http:\/\/www.linkwithin.com\/pixel.png\" alt=\"Related Posts Plugin for WordPress, Blogger...\" style=\"border: 0\" \/><\/a><script type=\"text\/javascript\" charset=\"utf-8\" src=\"http:\/\/w.sharethis.com\/widget\/?wp=6.9.7\"><\/script><a class=\"synved-social-button synved-social-button-share synved-social-size-48 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