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Decoding drivers of carbon flux attenuation in the oceanic biological pump
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Decoding drivers of carbon flux attenuation in the oceanic biological pump ½âÂ뺣ÑóÉúÎï±ÃÖÐ̼ͨÁ¿Ë¥¼õµÄÇý¶¯ÒòËØ ¡ø ×÷ÕߣºM. Bressac, E. C. Laurenceau-Cornec et al. ¡øÁ´½Ó£º https://www.nature.com/articles/s41586-024-07850-x ¡øÕªÒª£º ÔÚ´Ë£¬ÎÒÃÇչʾÁËC-RESPIREµÄÔλʵÑé½á¹û¡£C-RESPIREÊÇÒ»ÖÖ²¿ÊðÔÚ¶à¸öÖвãÉî¶ÈµÄË«Á£×ÓÀ¹½ØÆ÷ºÍÅàÑøÏ䣬ÓÃÓÚ²âÁ¿Î¢ÉúÎï½éµ¼µÄ¿ÅÁ£Óлú̼£¨POC£©Í¨Á¿Ë¥¼õ¡£ ÎÒÃÇ·¢ÏÖ£¬ÔÚ6¸ö²»Í¬µÄº£ÑóÌåϵÖУ¬¼´POCͨÁ¿µÄ30±¶·¶Î§ÄÚ£¬¿ÅÁ£¸½×Å΢ÉúÎïµÄ½µ½âΪͨÁ¿Ë¥¼õµÄ7%¡ª29%£¬ÕâÒâζן¡Óζ¯ÎïÔÚͨÁ¿Ë¥¼õÖз¢»ÓÁ˸ü´óµÄÓ°Ïì×÷Óá£Î¢ÉúÎïÔٿ󻯣¬±ê×¼»¯µ½POCͨÁ¿£¬ÔÚ²»Í¬µÄµØµãºÍÉî¶È·¶Î§20±¶£¬ÔÚ¸ßPOCͨÁ¿ÏÂËÙÂÊ×îµÍ¡£ ¸ß´ïÈý±¶±ä»¯µÄ´¹Ö±Ç÷ÊÆÓëµÍγ¶ÈµØÇøÇ¿ÁÒµÄζÈÌݶÈÓйء£ÓëÖ®Ïà·´£¬ÔÚÖиßγ¶ÈµØÇø£¬Î¶ȵÄÓ°Ïì½ÏС£¬¶ø´¹Ö±Ç÷ÊÆ¿ÉÄÜÓÉ¿ÅÁ£ÉúÎﻯѧ¡¢ÆÆË黯ºÍ΢ÉúÎïÉú̬ÉúÀí¹²Í¬¾ö¶¨¡£Âí¶¡ÇúÏߵĽ⹹½ÒʾÁËÇý¶¯Î¢ÉúÎï½éµ¼µÄPOCͨÁ¿Ë¥¼õµÄ»ù±¾»úÖÆ¡£ ¡ø Abstract£º Here we present in situ experimental findings from C-RESPIRE, a dual particle interceptor and incubator deployed at multiple mesopelagic depths, measuring microbially mediated POC flux attenuation. We find that across six contrasting oceanic regimes, representing a 30-fold range in POC flux, degradation by particle-attached microbes comprised 7¨C29 per cent of flux attenuation, implying a more influential role for zooplankton in flux attenuation. Microbial remineralization, normalized to POC flux, ranged by 20-fold across sites and depths, with the lowest rates at high POC fluxes. Vertical trends, of up to threefold changes, were linked to strong temperature gradients at low-latitude sites. In contrast, temperature played a lesser role at mid- and high-latitude sites, where vertical trends may be set jointly by particle biochemistry, fragmentation and microbial ecophysiology. This deconstruction of the Martin curve reveals the underpinning mechanisms that drive microbially mediated POC flux attenuation across oceanic provinces. |
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