ملخص

This figure shows sea level rise the end of the last glacial episode based on data from Fleming et al. 1998, Fleming 2000, and Milne et al. 2005. These papers collected data from various reports and adjusted them for subsequent vertical geologic motions, primarily those associated with post-glacial continental and hydroisostatic rebound. The first refers to deformations caused by the weight of continental ice sheets pressing down on the land the latter refers to uplift in coastal areas resulting from the increased weight of water associated with rising sea levels. Because of the latter effect and associated uplift, many islands, especially in the Pacific, experienced higher local sea levels in the mid-Holocene than they do today. Uncertainty about the magnitude of these corrections is the dominant uncertainty in many measurements of sea level change.

The black curve is based on minimizing the sum of squares error weighted distance between this curve and the plotted data. It was constructed by adjusting a number of specified tie points, typically placed every 1 kyr but at times adjusted for sparse or rapidly varying data. A small number of extreme outliers were dropped. Some authors propose the existence of significant short-term fluctuations in sea level such that the sea level curve might oscillate up and down about this ~1 kyr mean state. Others dispute this and argue that sea level change has largely been a smooth and gradual process. However, at least one episode of rapid deglaciation, known as meltwater pulse 1A, is agreed upon, and is indicated on the plot. A variety of other accelerated periods of deglaciation have been proposed (i.e. meltwater pulse 1B, 1C, 1D, 2, 3...), but it is unclear whether these actually occurred or merely reflect misinterpretation of difficult measurements. No other events are evident in the data presented above.

The lowest point of sea level during the last glaciation is not well constrained by observations (shown here as a dashed curve), but is generally argued to be approximately 130 ± 10 m below present sea level and to have occurred at approximately 22 ± 3 thousand years ago. The time of lowest sea level is more or less equivalent to the Last Glacial Maximum. Prior to this time, ice sheets were still increasing in size, so sea level had been decreasing almost continuously for approximately 100,000 years.

Copyright

This figure was prepared by Robert A. Rohde from published data, and is incorporated into the Global Warming Art project.

Image from Global Warming Art

This image is an original work created for Global Warming Art. Please refer to the image description page for more information.

يسمح نسخ وتوزيع و/أو تعديل هذه الوثيقة تحت شروط رخصة جنو للوثائق الحرة، الإصدار 1.2 أو أي إصدار لاحق تنشره مؤسسة البرمجيات الحرة؛ دون أقسام ثابتة ودون نصوص أغلفة أمامية ودون نصوص أغلفة خلفية. نسخة من الرخصة تم تضمينها في القسم المسمى GNU Free Documentation License.http://www.gnu.org/copyleft/fdl.htmlGFDLGNU Free Documentation Licensetruetrue

	هذا الملفُّ مُرخَّص بموجب رخصة المشاع الإبداعي نسبة المُصنَّف إِلى مُؤَلِّفه - المشاركة بالمثل 3.0 العامة
	يحقُّ لك: مشاركة العمل – نسخ العمل وتوزيعه وبثُّه إعادة إنتاج العمل – تعديل العمل حسب الشروط التالية: نسب العمل إلى مُؤَلِّفه – يلزم نسب العمل إلى مُؤَلِّفه بشكل مناسب وتوفير رابط للرخصة وتحديد ما إذا أجريت تغييرات. بالإمكان القيام بذلك بأية طريقة معقولة، ولكن ليس بأية طريقة تشير إلى أن المرخِّص يوافقك على الاستعمال. الإلزام بترخيص المُشتقات بالمثل – إذا أعدت إنتاج المواد أو غيرت فيها، فيلزم أن تنشر مساهماتك المُشتقَّة عن الأصل تحت ترخيص الأصل نفسه أو تحت ترخيص مُتوافِقٍ معه.
	تمت إضافة علامة الترخيص لهذا الملف كجزء من رخصة جنو للوثائق الحرة تحديث الترخيص.http://creativecommons.org/licenses/by-sa/3.0/CC BY-SA 3.0Creative Commons Attribution-Share Alike 3.0truetrue

References

• Fleming, Kevin, Paul Johnston, Dan Zwartz, Yusuke Yokoyama, Kurt Lambeck, and John Chappell (1998). "Refining the eustatic sea-level curve since the Last Glacial Maximum using far- and intermediate-field sites". Earth and Planetary Science Letters 163 (1-4): 327-342. doi:10.1016/S0012-821X(98)00198-8
• Fleming, Kevin Michael (٢٠٠٠) Glacial Rebound and Sea-level Change Constraints on the Greenland Ice Sheet، Australian National University PhD Thesis
• Milne, Glenn A., Antony J. Long and Sophie E. Bassett (2005). "Modelling Holocene relative sea-level observations from the Caribbean and South America". Quaternary Science Reviews 24 (10-11): 1183-1202. doi:10.1016/j.quascirev.2004.10.005

هذه geology الصورة / الصورتان باستعمال رسومات متجهية ملفات رسوميات شعاعية. It is recommended to name the SVG file "Post-Glacial Sea Level.svg" - then the template Vector version available (or Vva) does not need the new image name parameter.