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| Name | If ocean levels are rising, why can't we see it? |
| Video Uploader | Video From potholer54 |
| Upload Date | This Video Uploaded At 05-12-2021 08:57:16 |
| Video Discription | Compare two photos 130 years apart and it looks as though sea levels haven't moved. In fact, they have. This video closes the gap between photos and actual measurement. In answer to several questions about why sea level rises at different rates in different parts of the world, it is a complex mix of ocean currents, gravitational pull, atmospheric pressure, Earth's rotation, regional changes in ocean temperature and other factors. See: https://climate.nasa.gov/ask-nasa-climate/3002/sea-level-101-part-two-all-sea-level-is-local/ https://oceanservice.noaa.gov/facts/sealevel-global-local.html#:~:text=On%20average%2C%20sea%20level%20is,direction%20and%20magnitude%20of%20change. See also: NPR interview, Christopher Piecuch, climate scientist at Woods Hole Oceanographic Institute, discussing "Why Sea Level Rise Varies Across The World" CORRECTIONS: 1) The shades of blue on the map at 10:58 denote sea level falling, not rising at the lowest rate.. 2) I said glaciers cover around 10% or the Earth -- I should have said 10% of the land surface of the Earth. 3) Two posters pointed out that Reiss's question to Hansen could be taken to mean 'What would the view be like in 40 years' time if CO2 concentration was NOW double?" In other words, Hansen was predicting sea level 40 years AFTER a doubling of CO2." To be fair to Hansen, that's possible. If so, his prediction will very likely be correct. But it again stresses the need to have these predictions made in peer-reviewed scientific journals, where such ambiguity is eliminated, rather than books. TO SUPPORT THE CHARITY AND KEEP MY CHANNEL GOING.... ...please dnate here: https://healthinharmony.org/donate/ You can see more on how this groundbreaking charity trades heath care for forest care in my video https://www.youtube.com/watch?v=j9-GRugP9pU See also https://psmag.com/social-justice/save-the-trees-well-save-your-life-46121 for an explanation of their work. SOURCES: 255 billion tonnes ice lost per year: "Return to rapid ice loss in Greenland and recordloss in 2019 detected by the GRACE-FO satellites" Sasgen et al 2019 Sea level rise up to 2008: http://sealevel.colorado.edu/ up to 2008 "More than half of the predicted rise in future sea level caused by the enhanced greenhouse effect is currently thought to be due to the thermal expansion of the oceans.” "Thermal expansion in ocean and coupled general circulation models" Jacket et al. 2000 "Improved estimates of upper-ocean warming and multi-decadal sea level rise" Domingues et al 2008 “Rising sea level is one of the most serious consequences of global warming. In the past 50 years, sea level rose about 1.8 (plus or minus 0.3) millimeters a year. Satellite observations since 1993 indicate the pace has accelerated to about 3 millimeters per year.” -- http://earthobservatory.nasa.gov/Features/OceanCooling/page5.php Rise now 3.6mm a year: https://royalsociety.org/topics-policy/projects/climate-change-evidence-causes/question-14/ “A 20th century acceleration in global sea-level rise” -- Church and White, Geophysical Research letters, jan 2006 How sea level is measured: https://www.newscientist.com/lastword/mg24732991-200-how-do-we-measure-sea-level-if-it-is-always-rising/#ixzz7BJgwYUAv Calculations for thermosteric and ice-melt sea level rise: https://link.springer.com/article/10.1007/s10712-016-9387-x#Sec2 "Future sea level rise constrained by observations and long-term commitment" Mengel et al. "Transient response of the MOC and climate to potential melting of the Greenland Ice Sheet in the 21st century" Hu et al 2009 "Sea-level rise due to polar ice-sheet mass loss during past 695 warm periods." Dutton et al 2015 " Evidence of marine ice-cliff instability in Pine Island Bay from iceberg-keel plough marks" Wise 2017 Nature Communications "Coralgal reef morphology records punctuated sea-level rise during the last deglaciation" Khanna 2017 5-19m higher for +3 deg C rise in temp: "Constraints on global mean sea level during Pleistocene warmth." Dimitriu, 2019 See also: "The Duplin Formation... was 35 ± 18 m above present." Dowset and Cronin, cited in "Paleo Constraints on Future Sea-Level Rise" Kemp 2015 "We project anthropogenic sea level rise of 28–56 cm, 37–77 cm, and 57–131cm cm in 2100 for the greenhouse gas concentration scenarios RCP26, RCP45, and RCP85" RCP45" "Future sea level rise constrained by observations and long-term commitment" Mengel et al., 2016 https://www.salon.com/2001/10/23/weather/ E-mail from Bob Reiss: https://skepticalscience.com/Hansen-West-Side-Highway.htm Post from James Hansen: http://www.columbia.edu/~jeh1/mailings/2011/20110126_SingingInTheRain.pdf Sea level at time of CO2 doubling: I couldn't find any studies looking specifically at sea level when CO2 doubles in concentration. So I had to match predictions for when CO2 will double under RCP 4.5 (around 2065) with projections for sea level rise under RCP 4.5 at that time. WTRlSGKddJE |
| Category | Science & Technology |
| Tags | potholer54 | potholder54 | bill whittle | sea level rise | climate change | maldives |
