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

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Presentation transcript:

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

2IGARSS /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

3IGARSS /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 HY-2, CryoSat-2 and Altika available in the Arctic Ocean. 0

4IGARSS /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 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.

5IGARSS /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, 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.

6IGARSS /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 ( Data available from RADS.

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

8IGARSS /18/2014 Range and Geophysical corrections

9IGARSS /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

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

11IGARSS /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 to

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

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

14IGARSS /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: (independent process by Yalong Liu)

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

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

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

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

19IGARSS /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.

20IGARSS /18/2014 Thanks for your attention