Warmist New claim: ‘Recent sea level rise is highest in 6,000 years’ — DEBUNKED


By: - Climate DepotOctober 15, 2014 1:00 PM with 5 comments

Via: http://hockeyschtick.blogspot.com/2014/10/new-paper-claims-after-6000-year-pause.html

New paper claims after 6,000 year ‘pause’, sea levels began rising 150 years ago

A new paper published in PNAS finds global sea levels rose up to 8 times faster than the present after the peak of the last ice age ~20,000 years ago, followed by a large deceleration starting ~6,000 years ago to stable levels until “the renewed sea-level rise [beginning] at 100–150 years ago.”Examination of the data from the paper, however, shows the range of proxy sea levels is approximately 10 meters, far too large to discern the tiny ~1.5 mm/yr sea level rise over the past 150 years. The authors instead assume from other published studies of tide gauge measurements that the ~1.5 mm/yr sea level rise over the past 150+ years began at that point in time. Other papers find sea levels rising only 1.1-1.3 mm/yr over the past 203 years, and without acceleration. 

Regardless, even the IPCC concedes that there was no significant anthropogenic influence on climate prior to 1950, thus man is not be responsible for sea level rise beginning 150-200 years ago, at the end of the Little Ice Age.
The sea level rise over the past ~200 years shows no evidence of acceleration, which is necessary to assume a man-made influence. Sea level rise instead decelerated over the 20th centurydecelerated 31% since 2002 and decelerated 44% since 2004 to less than 7 inches per century. There is no evidence of an acceleration of sea level rise, and therefore no evidence of any man-made effect on sea levels. Sea level rise is primarily a local phenomenon related to land subsidence, not CO2 levels. Therefore, areas with groundwater depletion and land subsidence have much higher rates of relative sea level rise, but this has absolutely nothing to do with man-made CO2.As this post was being written, WUWT posted on this same journal article, which makes additional recommended points regarding much higher sea levels during prior interglacials, etc. 

Fig. 1. Global sea levels over the past 35,000 years. Horizontal axis is thousands of years before the present [i.e. present at the left side of graph]. Range of proxy studies of sea levels is approximately 10 meters over the past ~15,000 years.

Sea level and global ice volumes from the Last Glacial Maximum to the Holocene

  1. Kurt Lambecka,b,1,
  2. Hélène Roubya,b,
  3. Anthony Purcella,
  4. Yiying Suncand
  5. Malcolm Sambridgea
  1. Contributed by Kurt Lambeck, September 12, 2014 (sent for review July 1, 2014; reviewed by Edouard Bard, Jerry X. Mitrovica, and Peter U. Clark)
  1. Abstract

Significance

Several areas of earth science require knowledge of the fluctuations in sea level and ice volume through glacial cycles. These include understanding past ice sheets and providing boundary conditions for paleoclimate models, calibrating marine-sediment isotopic records, and providing thebackground signal for evaluating anthropogenic contributions to sea level. From ∼1,000 observations of sea level, allowing for isostatic and tectonic contributions, we have quantified therise and fall in global ocean and ice volumes for the past 35,000 years. Of particular note is that during the ∼6,000 y up to the start of the recent rise ∼100−150 y ago, there is no evidence forglobal oscillations in sea level on time scales exceeding ∼200 y duration or 15−20 cm amplitude.

Abstract

The major cause of sea-level change during ice ages is the exchange of water between ice and ocean and the planet’s dynamic response to the changing surface load. Inversion of ∼1,000 observations for thepast 35,000 y from localities far from former ice margins has provided new constraints on the fluctuation of ice volume in this interval. Key results are: (i) a rapid final fall in global sea level of ∼40 m in < 2,000 y at the onset of the glacial maximum ∼30,000 y before present (30 ka BP); (ii) a slow fall to −134 m from 29 to 21 ka BP with a maximum grounded ice volume of ∼52 × 106 km3 greater than today; (iii) after an initial short duration rapid rise and a short interval of near-constant sea level, the main phase of deglaciation occurred from ∼16.5 ka BP to ∼8.2 ka BP at an average rate of rise of 12 m⋅ka−1 punctuated by periods of greater, particularly at 14.5–14.0 ka BP at ≥40 mm⋅y−1 (MWP-1A), and lesser, from 12.5 to 11.5 ka BP (Younger Dryas), rates; (iv) no evidence for a global MWP-1B event at ∼11.3 ka BP; and (v) a progressive decrease in the rate of rise from 8.2 ka to ∼2.5 ka BP, after which ocean volumes remained nearly constant until the renewed sea-level rise at 100–150 y ago, with no evidence of oscillations exceeding ∼15–20 cm in time intervals ≥ 200 y from 6 to 0.15 ka BP.


  • Mozalin Cranz

    As long as there is money in global warming scam, lies will continue.

    • powers2be

      No truer statement regarding AGW or Climate Change can be
      told. For those uncertain souls, who don’t know what to believe, follow
      the money. Proponents of AGW are direct and indirect beneficiaries
      of money flow from the Private Sector as redirected by the Government. Jobs, good salaries, great healthcare and
      retirement benefits, not to mention world travel, nice hotels, per Diem meals
      and cocktails are all at risk should the word reach the voting masses that Man
      Made Global Warming is a hoax. Be aware that the U.S. and other World
      Governments have prepared a cottage industry scheme trading on “Carbon
      Credits.” Under such a system the
      Government will dictate the amount of energy every man, woman, child and
      company will be allowed to use. Al Gore
      is a major investor in the company that will operate as a clearing house for Carbon
      Credit trading. The level of corruption to the Climate Scam is limitless. What
      worse is, the primary media outlets are running cover for the scam. It will introduce an avalanche of new
      regulations that will drive the price of gas and electricity to budget busting
      levels for the average American household.

      Here is a better smell test. Ask yourselves what the character-defamed
      “Deniers”, those of us reviled by the primary media outlets, stand to
      gain by proving that the Climate Changes and that Man has nothing to do with
      it. The answer: nothing. We gain nothing by exposing the truth but we
      hold onto something.

      We fight against a co-opted press and Government-compensated
      scientific minority that holds itself up as a “Consensus.” We fight in order to
      hold onto our hard earned personal income and prevent the Government from
      stripping away a significant percentage of our personal liberties through
      bureaucratic fiat and EPA regulations that can do nothing to alter the
      natural occurrence of a solar driven changing climate. Always keep foremost in your uncertain mind
      that science is not about a majority rule masking itself as an unproven “Consensus”
      it is founded on empirical data that arrives at the truth. The truth that forces more powerful than man are
      changing the climate and have been since before we climbed out of the primordial
      swamp.

  • Iron Maiden

    My argument against these ‘sea level rise’ idiots is, USE YOUR EFFING EYES. How many cities do you SEE underwater?
    I just got back from the beach. Guess what? No sea level rise? No underwater cities. No homes flooded. On any beach. It didn’t happen anywhere after we were told 20 years ago that it would. Anywhere. And no, it’s not going to happen tomorrow. Or next year. Or a hundred years from now.
    But don’t believe me – BELIEVE YOUR EFFING EYES, MORON!

  • Uneducated Oaf

    Sea level changes are completely worthless without including some pertinent data. Sea Level without an average temperature of the water is meaningless. Yes water expands and contracts as temperature changes. Also, things like Hawaiian lava going into the ocean, growing the islands displaces water, causing a rise in sea levels. The more ships (supertankers, etc) displace water to float also having some, probably minor, affect on rising sea levels. This data is just unreferenced data just like global temperature measurement without referencing the sun’s thermal cycles.

    It is just a way to get money for research to study something without looking at the entire picture. Let’s use fundamentals of physics and all three steps of the “scientific method” instead of skipping the test to prove or disprove the theory and data.

  • Gale A

    So it is known that the oceans are rising? The only argument is the rate and or the increase in rate. Is that correct?