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url url url url
  2. Weltenzyklopädie
  3. کم‌اکسیژن (بوم‌شناسی) - ویکی‌پدیا، دانشنامهٔ آزاد
کم‌اکسیژن (بوم‌شناسی) - ویکی‌پدیا، دانشنامهٔ آزاد
از ویکی‌پدیا، دانشنامهٔ آزاد
مناطق جهانی هیپوکسی اقیانوس ۲۰۰۹
نقشهٔ جهانی سطح اکسیژن «کم» و «رو به زوال» در اقیانوس باز و آب‌های ساحلی.[۱] این نقشه سایت‌های ساحلی را نشان می‌دهد که در آن مواد مغذی انسانی باعث تشدید یا کاهش اکسیژن به <۲ میلی‌گرم در لیتر (<۶۳ میکرومول در لیتر) (نقاط قرمز) شده‌است؛ و همچنین مناطق حد اقل اکسیژن اقیانوس در ۳۰۰ متر (مناطق آبی سایه‌دار).[۲]

کم‌اکسیژن یا هیپوکسی (انگلیسی: Hypoxia) به شرایط کمی اکسیژن اشاره دارد. به‌طور معمول، ۲۰٫۹٪ گاز موجود در جو اکسیژن است. فشار نسبی اکسیژن در جو ۲۰٫۹٪ فشار کل فشارسنج است.[۳]

در آب، سطح اکسیژن بسیار پایین‌تر است، تقریباً ۷ پی‌پی‌ام ppm که برابر ۰٫۰۰۰۷ درصد در آب با کیفیت خوب وجود دارد و بسته به وجود جانداران فتوسنتز و فاصله نسبی با سطح، به صورت محلی نوسان می‌کند (اگر اکسیژن بیشتری در هوا وجود داشته باشد، در سطح دیگر پخش می‌شود، گرادیان فشار جزئی).[۴]

جستارهای وابسته

منابع

  1. ↑ Breitburg, D. , Levin, L. A. , Oschlies, A. , Gregoire, M. , Chavez, F. P. , and Conley, D. J. (2018) "Declining oxygen in the global ocean and coastal waters". Science, 359: eaam7240. doi:10.1126/science.aam7240.
  2. ↑ Benway, H.M. , Lorenzoni, L. , White, A.E. , Fiedler, B. , Levine, N.M. , Nicholson, D.P. , DeGrandpre, M.D. , Sosik, H.M. , Church, M.J. , O'Brien, T.D. and Leinen, M. (2019) "Ocean time series observations of changing marine ecosystems: an era of integration, synthesis, and societal applications", Frontiers in Marine Science, 6(393). doi:10.3389/fmars.2019.00393.
  3. ↑ Brandon, John. "The Atmosphere, Pressure and Forces". Meteorology. Pilot Friend. Retrieved 21 December 2012.
  4. ↑ "Dissolved Oxygen". Water Quality. Water on the Web. Archived from the original on 13 December 2012. Retrieved 21 December 2012.
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