【摘要】：云-氣溶膠激光雷達(dá)和紅外探測(cè)衛(wèi)星CALIPSO的主要載荷CALIOP能同時(shí)發(fā)射波長為532nm和1064nm的激光脈沖，研究表明主動(dòng)探測(cè)器CALIOP在獲取大氣云層和氣溶膠層參數(shù)的同時(shí)，532nm激光脈沖能穿透海表，獲取海洋水體中顆粒物的后向散射信息。由于1064nm波長的光大部分表層海水吸收，因此本文旨在利用CALIPSO提供的532nm通道一級(jí)數(shù)據(jù)產(chǎn)品，計(jì)算CALIOP接收系統(tǒng)光電倍增管的瞬態(tài)響應(yīng)函數(shù)，對(duì)水下原始數(shù)據(jù)進(jìn)行校正，獲得校正后的顆粒物后向散射系數(shù)，并研究其與MODIS大洋葉綠素濃度之間的關(guān)系。 利用CALIOP2008年532nm地表后向散射信號(hào)，結(jié)合胡永祥提出的拖尾峰值比方法計(jì)算地表引起的峰值信號(hào)以及其相鄰信號(hào)之間的關(guān)系。結(jié)果表明北半球冬季和夏季樣本數(shù)據(jù)特征呈現(xiàn)明顯的差異性，并且北半球春季、秋季樣本數(shù)據(jù)特征和冬季相同。并且北半球冬季數(shù)據(jù)中有43.6%的數(shù)據(jù)和夏季樣本數(shù)據(jù)特性一致，56.4%的數(shù)據(jù)特性和南極大陸以及格陵蘭島相一致，由于南極大陸以及格陵蘭島常年被冰雪覆蓋，因此判定北半球冬季和夏季CALIOP瞬態(tài)響應(yīng)的差異主要是由于冰雪因素引起。提取陸地表面后向散射信號(hào)以及該信號(hào)前一個(gè)采樣單元（bin）和緊鄰其后的10個(gè)采樣單元，利用Li提出方法可以計(jì)算得到CALIOP離散瞬態(tài)響應(yīng)函數(shù)，使用最小二乘法進(jìn)而求得瞬態(tài)響應(yīng)的分段連續(xù)函數(shù)。不考慮冰雪因素的影響，則不同地球表面CALIOP瞬態(tài)響應(yīng)函數(shù)是一致的。 由于CALIOP拖尾現(xiàn)象的存在，當(dāng)系統(tǒng)接收到來自海表的信號(hào)時(shí)，使得該信號(hào)能量延伸到之后相鄰的幾個(gè)采樣單元當(dāng)中，，造成測(cè)量的海洋次表層水體的后向散射信號(hào)偏大，因此為了獲得真實(shí)的后向散射信號(hào)，需使用瞬態(tài)響應(yīng)函數(shù)進(jìn)行校正。在廣闊的大洋海域，合理假設(shè)大洋海水中顆粒物的后向散射主要由浮游植物引起。本文利用2008年CALIPSO提供的第三版本一級(jí)數(shù)據(jù)產(chǎn)品和AMSR-E提供的海面風(fēng)速產(chǎn)品以及MODIS提供的葉綠素濃度和漫射衰減系數(shù)的年平均值，分別計(jì)算得到CALIPSO532nm波長水下信號(hào)和經(jīng)瞬態(tài)響應(yīng)校正后的信號(hào)，結(jié)果表明在在全球海域范圍，直接提取信號(hào)和校正后信號(hào)與MODIS葉綠素濃度的相關(guān)系數(shù)分別為0.54和0.58，在60°S-40°N范圍內(nèi)的廣闊海域，相關(guān)系數(shù)分別為0.72和0.79。
[Abstract]:The main payloads of cloud-aerosol lidar and infrared detection satellite CALIPSO CALIOP can simultaneously emit laser pulses with the wavelength of 532nm and 1064nm. It is shown that the active detector CALIOP can obtain the parameters of atmospheric clouds and aerosol layers at the same time. 532nm laser pulses can penetrate the sea surface to obtain the backward scattering information of particles in the ocean water. Because most of the light of 1064nm wavelength is absorbed by surface seawater, the purpose of this paper is to calculate the transient response function of photomultiplier tube of CALIOP receiving system by using the first-order data product of 532nm channel provided by CALIPSO, and to correct the original underwater data. The corrected backscatter coefficient of particulate matter was obtained and the relationship between the backscattering coefficient and chlorophyll concentration in MODIS ocean was studied. Based on the CALIOP2008 annual 532nm backscattering signal and Hu Yongxiang's trailing peak ratio method, the relationship between the surface peak signal and its adjacent signal is calculated. The results show that the characteristics of sample data in winter and summer of Northern Hemisphere are obviously different, and the characteristics of sample data in Spring and Autumn of Northern Hemisphere are the same as those in winter. In addition, 43.6% of the winter data in the Northern Hemisphere are consistent with the summer sample data, and 56.4% of the data are consistent with the Antarctic continent and Greenland, because the Antarctic continent and Greenland are covered with ice and snow all the year round. Therefore, the difference between winter and summer CALIOP transient responses in the Northern Hemisphere is mainly caused by ice and snow. The backscatter signal of the land surface and the former sampling unit (bin) and the next 10 sampling units are extracted. The discrete transient response function of CALIOP can be calculated by using the method proposed by Li. The piecewise continuous function of transient response is obtained by using the least square method. The CALIOP transient response function of different earth surface is consistent without considering the influence of ice and snow factors. Because of the existence of CALIOP trailing phenomenon, when the system receives the signal from the sea surface, the energy of the signal extends to several adjacent sampling units, which results in the large backscatter signal of the measured ocean subsurface water body. Therefore, in order to obtain the true backscattering signal, the transient response function should be used to correct it. In the vast ocean area, it is reasonable to assume that the backscattering of particulate matter in ocean water is mainly caused by phytoplankton. In this paper, the annual mean values of the third version of the first class data product provided by CALIPSO in 2008, the sea surface wind speed product provided by AMSR-E and the chlorophyll concentration and diffuse attenuation coefficient provided by MODIS are used. The underwater signals of CALIPSO532nm wavelength and the signals corrected by transient response were calculated respectively. The results show that the correlation coefficients between the extracted signals and the chlorophyll concentration of MODIS are 0.54 and 0.58 respectively in the global sea area. In the wide sea area of 60 擄S-40 擄N, the correlation coefficients are 0.72 and 0.79, respectively.
【學(xué)位授予單位】：中國海洋大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：P714.4

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