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[½»Á÷] A climate threshold for ocean deoxygenation during the Early Cretaceous

A climate threshold for ocean deoxygenation during the Early Cretaceous

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¡ø ×÷ÕߣºKohen W. Bauer, N. Ryan McKenzie et al.

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https://www.nature.com/articles/s41586-024-07876-1

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ÔÚ´Ë£¬ÎÒÃǵÄÑо¿ÏÔʾ£¬ÔÚ°×ÛѼʹóÑóȱÑõʼþ£¨OAE1a£©ÆÚ¼äº£Ñó¿ìËÙÍÑÑõÓë»ðɽ¶þÑõ»¯Ì¼ÅŷźÍÏà¹ØÆøºòãÐÖµµÄ¿çÔ½Óйء£´Ëºó£¬¹èËáÑη绯·´À¡ºÍÆøºò»Ö¸´µÄ»ºÂý²½·¥½«ÔÙÑõ»¯µÄÑÓ³Ùʼþ´óÓÚ1°ÙÍòÄê¡£ÔÚOAE1a½áÊøÊ±£¬ÖØÐÂÔ½¹ýÕâ¸öãÐÖµ²¢Ê¹µÃº£ÑóÔÙÑõ»¯¡£

È»¶ø£¬ÔÚOAE1aÖ®ºó£¬µØÇòϵͳ±£³Ö×ã¹»µÄÎÂů£¬ÒÔÖÁÓÚ¹ìµÀÇý¶¯µÄÆøºò¶¯Á¦Ñ§µ¼Öº£ÑóÔÚ´óÔ¼10ÒÚÄêµÄʱ¼ä³ß¶ÈÉϼÌÐøÑ­»·ÍÑÑõ£¬²¢³ÖÐøÁË1°ÙÍòÄê¡£Òò´Ë£¬ÎÒÃǵĽá¹û°µÊ¾ÁË»ðɽ×÷Óᢷ绯×÷Óúͺ£ÑóÑõº¬Á¿Ö®¼äµÄ½ôÃÜñîºÏ£¬ÕâÖÖñîºÏÒÔÆøºòãÐÖµÎªÌØÕ÷¡£

¡ø Abstract£º

Here we show that rapid ocean deoxygenation during OAE1a is linked to volcanic CO2emissions and the crossing of an associated climate threshold, after which the sluggish pace of the silicate-weathering feedback and climate recovery delayed reoxygenation for >1 Myr. At the end of OAE1a, recrossing this threshold allowed for ocean reoxygenation. Following OAE1a, however, the Earth system remained sufficiently warm such that orbitally forced climate dynamics led to continued cyclic ocean deoxygenation on approximately 100-kyr timescales for another 1 Myr. Our results thus imply a tight coupling between volcanism, weathering and ocean oxygen content that is characterized by a climate threshold.
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