Feature Comparison of Two Mesoscale Eddy Datasets Based on Satellite Altimeter Data
Abstract
:1. Introduction
2. Data and Methods
2.1. Data
2.1.1. Satellite Remote Sensing Data
2.1.2. Mesoscale Eddy Trajectory Atlas Product Version 2.0 (META v2.0)
2.1.3. Global Ocean Mesoscale Eddy Atmospheric-Oceanic-Biological Interaction Observational Dataset 1.0 (GOMEAD v1.0)
2.2. Eddy Detection Schemes
2.2.1. META Eddy Detection
- The amplitude of the test area must be equal to or smaller than that of the area already defined.
- The distance between the two remotest points must be less than a maximum diameter for a given eddy. Distance max = 700 km for latitudes lower than 25°, or 400 km for latitudes higher than 25°.
- No more than 2000 pixels.
- No latitude holes on the edges and no holes within the interior of the area.
2.2.2. GOMEAD Eddy Detection
- The velocity component u’ in the north–south direction have opposite signs on both sides of the eddy center, and their absolute value increases as they move away from the center.
- The velocity component v’ in the east–west direction have opposite signs on both sides of the eddy center, and their absolute value increases as they move away from the center.
- The minimum velocity point within the selected range is the undetermined eddy center.
- The direction of the two adjacent velocity vectors around the eddy center must be close to each other and must be in the same or adjacent quadrants to ensure the same direction of rotation.
2.2.3. Similarities and Differences of Two Datasets
2.3. Eddy Tracking Method
2.3.1. META Dataset Eddy Tracking Method
2.3.2. GOMEAD Dataset Eddy Tracking Method
2.4. Introduction to the Study Area
3. Results
3.1. Eddy Characteristics Statistics
3.2. Temporal Distribution
3.3. Spatial Distribution
3.4. Time Evolution
3.5. Eddy Movement
4. Discussion
4.1. Eddy Center Difference
4.2. Eddy Number Difference
4.3. Eddy Radius Difference
4.4. Eddy Lifespan Difference
5. Conclusions
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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META | GOMEAD | |
---|---|---|
Raw data | SLA | SLA |
Data used for detection | SLA | Vector Geometry |
Resolution | 1/4° | 1/6° |
Categorization of methods | physical parameter based | geometric velocity field based |
Eddy center | Centroid | Point of minimum flow speed |
Eddy edge | Not provided | closed contours with the largest geometric velocity of the stream function |
Radius | Radius of a circle whose area is equal to that enclosed by the contour of maximum circum-average geostrophic speed | The average distance from the center to each point on the edge of the eddy |
Amplitude | |SSH (extremum) – SSH (edge)| | It is the same as META (Not directly provided, but can be readily computed) |
Regions | Latitude | Longitude |
---|---|---|
SF | 121°E–150°W | 15°N–28°N |
KE | 140°E–170°W | 28°N–42°N |
SCS | 105°E–121°E | 5°N–25°N |
CC | 105°W–140°W | 20°N–40°N |
Regions | Parameter (unit) | META | GOMEAD | ||
---|---|---|---|---|---|
AE | CE | AE | CE | ||
SF | Number | 5657 | 6297 | 5443 | 6053 |
Radius (km) | 97.16 (28.20) | 93.71 (26.94) | 111.01 (38.02) | 107.19 (36.38) | |
Lifespan (day) | 79.05 (64.87) | 72.62 (54.18) | 66.33 (45.06) | 63.65 (36.40) | |
Amplitude (cm) | 6.68 (3.69) | 6.87 (3.84) | 7.54 (4.35) | 7.28 (3.86) | |
KE | Number | 3560 | 3797 | 3402 | 3320 |
Radius (km) | 80.57 (20.87) | 78.24 (18.76) | 106.71 (38.66) | 104.60 (36.15) | |
Lifespan (day) | 92.03 (85.87) | 89.62 (80.53) | 69.99 (51.41) | 68.13 (51.13) | |
Amplitude (cm) | 9.81 (7.28) | 10.14 (8.42) | 13.90 (10.49) | 14.76 (12.87) | |
SCS | Number | 733 | 855 | 746 | 782 |
Radius (km) | 109.80 (32.32) | 105.11 (29.75) | 90.43 (23.71) | 89.23 (23.70) | |
Lifespan (day) | 59.20 (36.09) | 54.65 (29.20) | 57.44 (29.52) | 56.56 (26.61) | |
Amplitude (cm) | 6.52 (3.96) | 6.34 (3.55) | 4.63 (3.02) | 4.64 (2.64) | |
CC | Number | 3338 | 3363 | 2800 | 2912 |
Radius (km) | 74.57 (16.46) | 73.81 (16.41) | 90.36 (28.15) | 92.28 (27.23) | |
Lifespan (day) | 80.93 (66.52) | 86.75 (77.19) | 66.78 (46.82) | 72.12 (51.92) | |
Amplitude (cm) | 3.41 (1.77) | 3.81 (2.19) | 4.33 (2.22) | 4.88 (2.72) | |
Total | Number | 13288 | 14312 | 12391 | 13067 |
Radius (km) | 87.74 (26.51) | 85.61 (25.05) | 103.93 (36.54) | 102.14 (34.48) | |
Lifespan (day) | 81.91 (70.77) | 79.38 (67.52) | 66.90 (46.62) | 66.25 (44.03) | |
Amplitude (cm) | 6.69 (5.19) | 6.99 (5.67) | 8.39 (7.31) | 8.49 (8.09) |
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You, Z.; Liu, L.; Bethel, B.J.; Dong, C. Feature Comparison of Two Mesoscale Eddy Datasets Based on Satellite Altimeter Data. Remote Sens. 2022, 14, 116. https://doi.org/10.3390/rs14010116
You Z, Liu L, Bethel BJ, Dong C. Feature Comparison of Two Mesoscale Eddy Datasets Based on Satellite Altimeter Data. Remote Sensing. 2022; 14(1):116. https://doi.org/10.3390/rs14010116
Chicago/Turabian StyleYou, Zhiwei, Lingxiao Liu, Brandon J. Bethel, and Changming Dong. 2022. "Feature Comparison of Two Mesoscale Eddy Datasets Based on Satellite Altimeter Data" Remote Sensing 14, no. 1: 116. https://doi.org/10.3390/rs14010116