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HY-2A Satellite Altimetric data Evaluation in the Arctic Ocean Yongcun Cheng Ole Baltazar Andersen.

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Presentation on theme: "HY-2A Satellite Altimetric data Evaluation in the Arctic Ocean Yongcun Cheng Ole Baltazar Andersen."— Presentation transcript:

1 HY-2A Satellite Altimetric data Evaluation in the Arctic Ocean Yongcun Cheng Ole Baltazar Andersen

2 2IGARSS 2014 07/18/2014 Outline 1.Introduction  Status of altimetric data in the Arctic Ocean (>66ºN)  HY-2A (Data from NSOAS, IGDR)  SARAL/AltiKa  CryoSat-2 2. HY-2A altimetric data in the Arctic Ocean  Applied range and geophysical corrections  Comparision with RADS Altika and CryoSat-2 data  DUACS NRT HY-2A data  20+ years of sea level timeries in the Arctic Ocean 3. Summary

3 3IGARSS 2014 07/18/2014 Data Status Feb. Mar. 1 Jul. Data availability in along-track RADS (ERS-1/2-Envisat), reprocessed (ERS-1/2-Envisat) and DUACS gridded weekly sea level products. Envisat was dead in April 2012. HY-2, CryoSat-2 and Altika available in the Arctic Ocean. 0

4 4IGARSS 2014 07/18/2014 HY-2A overview o HY-2A (‘HaiYang’ denotes Ocean) from the National Satellite Ocean Application Service has been designed for the monitoring the Ocean dynamics. o HY-2A was launched in August 2011. o HY-2A payloads: Radar altimeter (Ku and C bands), orbit altitude of 965 km, sun-synchronous with 99º inclination. o Repeat cycle: 14 days (for three years) and 168 days. o Data available from NSOAS.

5 5IGARSS 2014 07/18/2014 SARAL/AltiKa overview o Operator: ISRO/CNES, enable better observation of ice, rain, coastal zones, land masses (forests, etc.), and wave heights. o SARAL was launched in Feb, 2013. o SARAL payloads: Radar altimeter (Ka band), orbit altitude of 800 km, sun- synchronous with 98.55º inclination. o Repeat cycle: 35 days (the same ground- track as Envisat) o Data available from RADS.

6 6IGARSS 2014 07/18/2014 CryoSat-2 overview The SAR mode (green) operated over ice-covered regions and the coastal zone. The SAR Interferometric (SARIn) and Low Resolution Mode (LRM) modes are in purple and red, respectively (https://earth.esa.int).https://earth.esa.int Data available from RADS.

7 7IGARSS 2014 07/18/2014 Range and Geophysical corrections Andersen and Scharroo, 2011

8 8IGARSS 2014 07/18/2014 Range and Geophysical corrections

9 9IGARSS 2014 07/18/2014 RADS (AltiKa and CryoSat-2): Dry tropospheric correction ： ECMWF model Wet tropospheric correction ： radiometer measurements (AltiKa)/ECMWF model (CryoSat-2) Ionosphere correction ： NIC09 Sea State Correction ： hybrid model Ocean tide ： GOT4.8 Inverted Barometer ： MOG2D MSS: DTU10 Range and Geophysical corrections

10 10IGARSS 2014 07/18/2014 Sea level anomaly (in meters) maps for the same period between 20130803 and 20130817 (HY-2A cycle049) |SLA|<1m Summer HY-2A AltiKa CryoSat-2

11 11IGARSS 2014 07/18/2014 HY-2A Globally data CryoSat-2 Jason-2 HY-2A +10cm AltiKa CryoSat-2 Jason-2 Sea level anomaly (in m): Time period 20130808 to 20130817.

12 12IGARSS 2014 07/18/2014 All corrections (50 º S-50 º N) Time period: 201305 (independent process by Yalong Liu)

13 13IGARSS 2014 07/18/2014 Sea level anomaly (in meters) maps for the same period between 20140104 and 20140118 (HY-2A cycle060) HY-2A AltiKa CryoSat-2 Winter

14 14IGARSS 2014 07/18/2014 HY-2/Jason-2 crossover dif. Crossover sea surface height differences between Jason-2 and HY-2 satellite altimetric data in December 2013 Time period: 201312 (independent process by Yalong Liu)

15 15IGARSS 2014 07/18/2014 DUACS NRT HY-2A data

16 16IGARSS 2014 07/18/2014 DUACS NRT HY-2A data (Available from 20140514) SLA map for the time period 20140514-20140601 CryoSat-2 (RADS) HY-2A (DUACS) AltiKa (RADS)

17 17IGARSS 2014 07/18/2014 Sea level timeseries in the Arctic Ocean DTU reprocessed ERS-1/2-Envisat (black) RADS CryoSat-2 (blue) RADS AltiKa (red)

18 18IGARSS 2014 07/18/2014 Sea level timeseries in the Arctic Ocean (HY-2A) SLA cycle averaged Number of data m

19 19IGARSS 2014 07/18/2014 Summary 1.HY-2A satellite altimetry provides valuable data in the Arctic Ocean. 2.More alternative range and geophysical corrections are required in the released HY-2A data sets for comparison. 3.The bias among the satellite altimetry missions needs further investigation to improve the long term sea level time series in the Arctic Ocean. 4.SLA ‘drops’ in 2013 needs further investigation.

20 20IGARSS 2014 07/18/2014 Thanks for your attention

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