Quantifying the gross and net production is an essential component of carbon cycling and marine ecosystem studies. Triple oxygen isotope measurements and the O₂/Ar ratio are powerful indices in quantifying the gross primary production and net community production of the mixed layer zone, respectively. Although there is a substantial advantage in refining the gas exchange term and water column vertical mixing calibration, application of mixed layer depth history to the gas exchange term and its contribution to reducing indices error are unclear. Therefore, two cruises were conducted in the slope regions of the northern South China Sea in October 2014 (autumn) and June 2015 (spring). Discrete water samples at Station L07 in the upper 150 m depth were collected for the determination of δ¹⁷O, δ¹⁸O, and the O₂/Ar ratio of dissolved gases. Gross oxygen production (GOP) was estimated using the triple oxygen isotopes of the dissolved O₂, and net oxygen production (NOP) was calculated using O₂/Ar ratio and O₂ concentration. The vertical mixing effect in NOP was calibrated via a N₂O based approach. GOP for autumn and spring was (169±23) mmol/(m²·d) (by O₂) and (189±26) mmol/(m²·d) (by O₂), respectively. While NOP was 1.5 mmol/(m²·d) (by O₂) in autumn and 8.2 mmol/(m²·d) (by O₂) in spring. Application of mixed layer depth history in the gas flux parametrization reduced up to 9.5% error in the GOP and NOP estimations. A comparison with an independent O₂ budget calculation in the diel observation indicated a 26% overestimation in the current GOP, likely due to the vertical mixing effect. Both GOP and NOP in June were higher than those in October. Potential explanations for this include the occurrence of an eddy process in June, which may have exerted a submesoscale upwelling at the sampling station, and also the markedly higher terrestrial impact in June.

量化总产量和净产量是碳循环和海洋生态系统研究的重要组成部分。三重氧同位素测量值和 O ₂ /Ar 比值是分别量化混合层带初级生产总值和净群落生产的有力指标。尽管在细化气体交换项和水柱垂直混合校准方面具有显着优势，但混合层深度历史在气体交换项中的应用及其对减少指数误差的贡献尚不清楚。因此，2014年10月（秋季）和2015年6月（春季）在南海北部斜坡区进行了两次巡航。采集 L07 站上部 150 m 深度的离散水样，用于测定 δ ¹⁷O、δ ¹⁸ O 和溶解气体的O ₂ /Ar 比。使用溶解的O ₂的三氧同位素估计总产氧量(GOP) ，使用O ₂ /Ar 比和O ₂浓度计算净产氧量(NOP) 。NOP 中的垂直混合效应通过基于 N ₂ O 的方法进行校准。秋季和春季的 GOP 分别为 (169±23) mmol/(m ² ·d) (by O ₂ ) 和 (189±26) mmol/(m ² ·d) (by O ₂ )。秋季NOP为1.5 mmol/(m ² ·d)(by O ₂ )，秋季NOP为8.2 mmol/(m ² ·d)(by O ₂） 在春天。在气体通量参数化中混合层深度历史的应用将 GOP 和 NOP 估计中的误差减少了 9.5%。与diel 观察中的独立 O ₂预算计算的比较表明当前 GOP 高估了 26%，可能是由于垂直混合效应。6 月份的 GOP 和 NOP 均高于 10 月份。对此的潜在解释包括 6 月份发生了涡流过程，这可能在采样站产生了亚中尺度上升流，以及 6 月份明显更高的陆地影响。