GOCE衛(wèi)星數(shù)據(jù)確定的全球穩(wěn)態(tài)海面地形和海表地轉(zhuǎn)流
本文選題:GOCE衛(wèi)星 + 地球重力場(chǎng)模型。 參考:《地球物理學(xué)進(jìn)展》2017年04期
【摘要】:利用GOCE衛(wèi)星235天的觀測(cè)數(shù)據(jù)恢復(fù)了200階次的重力場(chǎng)模型SWJTU-GO01S,結(jié)合歐空局提供的最新GOCE重力場(chǎng)模型和CNES-CLS 2011平均海面高模型,計(jì)算了全球穩(wěn)態(tài)海面地形和海表地轉(zhuǎn)流,并采用GRACE模型、多源數(shù)據(jù)同化模型和海洋浮標(biāo)觀測(cè)數(shù)據(jù)對(duì)GOCE模型的計(jì)算結(jié)果進(jìn)行對(duì)比分析.結(jié)果表明:由于重力場(chǎng)模型精度和分辨率較高,GOCE計(jì)算結(jié)果所需的濾波半徑小于GRACE結(jié)果;GOCE和GRACE模型的計(jì)算結(jié)果與CNES-CLS09穩(wěn)態(tài)海面地形差異的RMS分別為6 cm和7 cm左右;與海洋浮標(biāo)實(shí)測(cè)數(shù)據(jù)對(duì)比發(fā)現(xiàn),GOCE和GRACE的計(jì)算結(jié)果與實(shí)測(cè)數(shù)據(jù)差異明顯,但GOCE的計(jì)算結(jié)果優(yōu)于GRACE結(jié)果,而SWJTU-GO01S與DIR-R4和TIM-R4模型在全球范圍內(nèi)具有較好的一致性.整體而言,GOCE比GRACE數(shù)據(jù)的計(jì)算結(jié)果可以反映更小尺度地轉(zhuǎn)流,且計(jì)算的精度更高;海洋環(huán)流結(jié)果和水準(zhǔn)數(shù)據(jù)的對(duì)比表明SWJTU-GO01S與DIR-R4和TIM-R4模型的精度符合性較好,三者計(jì)算的地轉(zhuǎn)流精度基本相當(dāng).
[Abstract]:The gravity field model SWJTU-GO01S of order 200 has been restored by using the observation data from the GOCE satellite for 235 days. Combined with the latest GOCE gravity field model provided by ESA and the average sea surface height model CNES-CLS 2011, the global steady sea surface topography and surface geostrophic currents have been calculated, and the Grace model has been used. The multisource data assimilation model and ocean buoy observation data are compared and analyzed to the calculation results of GOCE model. The results show that because the precision and resolution of gravity field model are higher than that of Grace model, the RMS of the difference between the calculated results and CNES-CLS09 steady-state sea surface topography is about 6 cm and 7 cm, respectively. Comparing with the measured data of ocean buoy, it is found that the calculated results of GOCE and Grace are obviously different from the measured data, but the results of GOCE are superior to those of Grace, while SWJTU-GO01S is in good agreement with DIR-R4 and TIM-R4 models in the global scope. On the whole, the calculated results of GOCE are more accurate than those of Grace data, and the comparison of ocean circulation results with leveling data shows that SWJTU-GO01S has better accuracy than DIR-R4 and TIM-R4 models. The accuracy of geostrophic flow calculated by the three methods is basically the same.
【作者單位】: 西南石油大學(xué)土木工程與建筑學(xué)院;
【基金】:國(guó)家自然科學(xué)基金(41574018,41404018) 大地測(cè)量與地球動(dòng)力學(xué)國(guó)家重點(diǎn)實(shí)驗(yàn)室開放基金(SKLGED2017-2-1-E)聯(lián)合資助
【分類號(hào)】:P223
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