Journal of Tropical Oceanography ›› 2023, Vol. 42 ›› Issue (4): 113-124.doi: 10.11978/2022166CSTR: 32234.14.2022166
• Marine Biology • Previous Articles Next Articles
Intra-seasonal regulation and mechanism on sea surface chlorophyll in the upwelling off the coast of Vietnam
LIN Shaowen1(
), REN Hengye2, LU Wenfang2,3()
- 1. The Academy of Digital China, Fuzhou University, Fuzhou 350108, China
2. School of Marine Sciences, Sun Yat-sen University, Zhuhai 519000, China
3. Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai 519000, China
-
Received:2022-07-25Revised:2022-10-06Online:2023-07-10Published:2022-10-11 -
Supported by:National Natural Science Foundation of China(41906019)
Cite this article
LIN Shaowen, REN Hengye, LU Wenfang. Intra-seasonal regulation and mechanism on sea surface chlorophyll in the upwelling off the coast of Vietnam[J].Journal of Tropical Oceanography, 2023, 42(4): 113-124.
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Fig. 1
Average chlorophyll in summer. The red box is the coastal area, and the yellow box is the offshore area"
Fig. 1
Fig. 2
Summer MJO wind speed anomaly (a~e) and SST anomaly (f~j). Lag 0 represents the 11-day average of wind speed anomaly in the South China Sea with a 55 day-lag center window. Lag -20 represents the 11-day average starting from 55 days. Lag 20 represents the last 11 days, and so on"
Fig. 2
Fig. 3
Summer MJO surface wind anomaly (a~i) and summer MJO SST anomaly (j~r). Summer MJO wind speed anomaly (a~h) correspond to the longer color bar on the right side, and the average of non-MJO wind speed (i) corresponds to the shorter color bar on its right side. Summer MJO SST anomaly (j~q) correspond to the longer color bar on the right side, and average SST in summer (r) correspond to the shorter color bar on its right side. N represents the days of each mode. The red box shows the VBUS sea area"
Fig. 3
Fig. 4
Summer MJO chlorophyll anomaly (a~h) and the average non MJO chlorophyll in summer (i). N represents the number of days in each mode. The red box shows the VBUS region. (a~h) correspond to the longer color bar on the right side, and (i) corresponds to the shorter color bar on the right side"
Fig. 4
Fig. 5
Zonal surface geostrophic velocities anomaly (a~i) and Ekman pumping velocity anomaly during summer MJO (j~r). Zonal surface geostrophic velocities anomaly (a~h) correspond to the longer color bar on the right side, and average zonal surface geostrophic velocities in summer (i) corresponds to the shorter color bar on its right side. Ekman pumping velocity anomaly (j~q) correspond to the longer color bar on the right side, and average Ekman pumping velocity (r) corresponds to the shorter color bar on its right side. N represents the days of each mode"
Fig. 5
Tab. 1
Correlation between chlorophyll concentration and mean modal sequences of various factors in the VBUS area (N=8)"
| 因素 | 与叶绿素浓度的相关系数(r) | p值 |
|---|---|---|
| SST | -0.94 | <0.001 |
| 降水 | 0.12 | 0.78 |
| 风速 | 0.64 | <0.1 |
| 海表动能 | 0.71 | <0.05 |
| 地转流纬向分量 | 0.82 | <0.05 |
| 地转流经向分量 | -0.07 | 0.87 |
| Ekman泵吸速率 | 0.81 | <0.05 |
Tab. 1
Fig. 6
RMM index and time series of various factors. The first row is the time series of RMM index. Except for the first row, the left column is the time series of various factors in the coastal area, and the right column is the time series of various factors in the offshore area. The red part is the data during summer MJO events. The interval between dotted lines with small spacing is the summer time"
Fig. 6
Tab. 2
GAMs results of various factors in VBUS"
| 区域 | 因素 | 估计自由度 | 参考自由度 | F值 | p值 |
|---|---|---|---|---|---|
| 沿岸区域 | SST | 6.316 | 7.503 | 98.355 | <2×10-16*** |
| 海表动能 | 8.093 | 8.778 | 3.503 | 2.53×10-4*** | |
| 地转流纬向分量 | 8.776 | 8.983 | 16.272 | <2×10-16*** | |
| Ekman泵吸 | 2.362 | 3.081 | 11.241 | 5.19×10-7*** | |
| 海表风速 | 2.309 | 2.918 | 8.063 | 3.64×10-5*** | |
| 离岸区域 | SST | 7.290 | 8.296 | 78.722 | <2×10-16*** |
| 海表动能 | 8.648 | 8.961 | 11.181 | <2×10-16*** | |
| 地转流纬向分量 | 8.517 | 8.931 | 64.410 | <2×10-16*** | |
| Ekman泵吸 | 3.896 | 4.931 | 2.501 | 2.69×10-2* | |
| 海表风速 | 1.787 | 2.252 | 4.052 | 1.25×10-2* |
Tab. 2
Tab. 3
GAMs Results of various factors in VBUS coastal area in 2010 and 2016"
| 年份 | 因素 | 估计自由度 | 参考自由度 | F值 | p值 |
|---|---|---|---|---|---|
| 2010 | SST | 3.376 | 4.112 | 2.823 | 3.743×10-2* |
| 海表动能 | 7.433 | 8.273 | 3.561 | 3.56×10-3** | |
| 地转流纬向分量 | 7.448 | 8.287 | 10.318 | <2×10-16*** | |
| Ekman泵吸 | 1.395 | 1.668 | 1.808 | 1.3650×10-1 | |
| 海表风速 | 1.000 | 1.000 | 21.935 | 3.95×10-5*** | |
| 2016 | SST | 3.477 | 4.428 | 12.371 | 1.10×10-6*** |
| 海表动能 | 7.371 | 8.306 | 15.703 | <2×10-16*** | |
| 地转流纬向分量 | 9.000 | 9.000 | 51.157 | <2×10-16*** | |
| Ekman泵吸 | 7.853 | 8.611 | 5.760 | 4.24×10-5*** | |
| 海表风速 | 1.000 | 1.000 | 0.271 | 6.05×10-1 |
Tab. 3
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