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Ocean uptake of anthropogenic CO2 in a general circulation. Biogeochemical model including isopycnal diffusion. 海洋在总循环中对人为CO2的吸收。生物地球化学模型包括等压扩散。
Q4 Earth and Planetary Sciences Pub Date : 2001-01-01 DOI: 10.2467/MRIPAPERS.51.125
Atsushi Obata
The invasion of anthropogenic carbon dioxide (CO2) in the ocean is simulated with an ocean biogeochemical circulation model. The model includes an isopycnal diffusion scheme for realistic tracer distributions in the ocean interior. Anthropogenic CO2 is added to a one-box atmosphere in the course of a simulated time integration from the preindustrial state to the present day. The atmospheric CO2 concentration in the model increases and reaches 354 μatm in 1990. The ocean uptake of anthropogenic CO2 is 2.1 GtC year-1 of the anthropogenic CO2 emission of 6 GtC year-1. The subpolar and polar regions in the basins, the equatorial Pacific and the Southern Ocean are strong sinks. In these regions deep waters, which are not equilibrated with atmospheric CO2, are supplied to the surface primarily by wind-driven upwelling. Much anthropogenic CO2 is accumulated in the subtropical gyres by Ekman convergence of surface waters and is transported to the depths in the North Atlantic through the deep western boundary current, respectively. These results are consistent with previous observational and model studies. The isopycnal diffusion in the model plays an important role in the uptake of anthropogenic CO2 at subpolar and polar latitudes and in its transport to the depths. The time integration into the future indicates that advection by the North Atlantic Deep Water is most effective in the century-scale transport of anthropogenic CO2 into the ocean interior. Central regions of subtropical gyres become filled with anthropogenic CO2 and are less effective for the uptake of anthropogenic CO2.
利用海洋生物地球化学循环模型模拟了人为二氧化碳(CO2)在海洋中的入侵。该模型包括一种海洋内部真实示踪剂分布的等压扩散格式。在从工业化前状态到现在的模拟时间积分过程中,人为的二氧化碳被添加到一个单盒大气中。模式内大气CO2浓度增加,1990年达到354 μatm。海洋对人为CO2的吸收为人为CO2排放的6gtc -1中的2.1 GtC -1。盆地的次极区和极区、赤道太平洋和南大洋是强下沉区。在这些地区,与大气中二氧化碳不平衡的深水主要由风驱动的上升流提供给地表。大量的人为CO2通过地表水的Ekman辐合在副热带环流中积累,并分别通过深层西部边界流输送到北大西洋深处。这些结果与以前的观测和模型研究一致。模式中的等环流扩散在次极和极纬度人为CO2的吸收及其向深海的输送中起着重要作用。对未来的时间积分表明,北大西洋深水的平流在百年尺度的人为二氧化碳向海洋内部输送中最为有效。副热带环流的中心区域充满了人为二氧化碳,对吸收人为二氧化碳的效率较低。
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引用次数: 1
A Case Study of Local Wind-Blown Dust Observed in Tsukuba, Japan 日本筑波地区风沙观测的个案研究
Q4 Earth and Planetary Sciences Pub Date : 2001-01-01 DOI: 10.2467/MRIPAPERS.52.9
K. Okada, M. Ikegami
つくばにおいて、1991年2月5日の日中に発生した風塵を観測した。半径0.15から5μmのエアロゾル個数粒径分布の時間変化をオプティカルカウンターにより測定した。また、電子顕微鏡によって粒子組成を分析するため、エアロゾル粒子を電子顕微鏡グリッド上に採集した。 風塵の発生は大気の激しい鉛直混合が起っている気象状態において認められた。その発生時におけるエアロゾル粒径分布は、半径1μm以上の粗大粒子の濃度が高かった。しかし、電子顕微鏡分析から、粗大鉱物粒子のモードだけでなく、半径0.5μmより小さい半径領域にも鉱物粒子のモードがあることが分かった。 水平風速の増大による砂粒子のsaltationによるsandblastingとbombardment過程に加えて、塵旋風による鉱物粒子の巻き上げも風塵の発生にとって重要であることが示唆された。
在筑波,观测了1991年2月5日白天发生的风尘。利用光学计数器测量了半径从0.15到5μm的气溶胶个数粒径分布的时间变化。另外,为了通过电子显微镜分析粒子组成,在电子显微镜网格上采集了气溶胶粒子。风尘的产生是在大气严重垂直混合的气象状态下被认可的。那个发生时的气溶胶粒径分布,半径1μm以上的大型粒子的浓度高。但是,从电子显微镜分析得知,不仅是大型矿物粒子的模式,半径小于0.5μm的半径区域也有矿物粒子的模式。除了由于水平风速增大而引起的沙粒子saltation引起的sandblasting和bombardment过程之外,尘埃旋风引起的矿物粒子卷起对风尘的产生也很重要。
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引用次数: 3
Seismic Moment Estimation of Small Earthquakes by Waveform Fitting. 用波形拟合估计小地震的地震矩。
Q4 Earth and Planetary Sciences Pub Date : 2000-01-01 DOI: 10.2467/MRIPAPERS.51.1
A. Katsumata
We developed an X-window program for estimating seismic moments and fault parameters of small earthquakes by waveform fitting. The graphical interface was adopted for operational convenience in routine processing. Manual parameter searching was implemented in the tool as well as waveform inversion. Body wave data recorded at stations within 100 kilometers of hypocenters are compared with synthetic records. Frequency components slightly lower than the corner frequency are used to estimate source parameters. Time for calculating synthetic records was reduced by preparing Green's functions beforehand. Source parameters were estimated by the tool for the earthquakes of Mw from 3.5 to 6.1 in the southern Kanto area.
我们开发了一个用波形拟合估计小地震地震矩和断层参数的x窗口程序。在日常处理中采用图形化界面,方便操作。该工具实现了手动参数搜索和波形反演。在震源100公里内的监测站记录的体波数据与合成记录进行比较。使用略低于角频率的频率分量来估计源参数。通过事先准备格林函数,减少了计算合成记录的时间。利用该工具估算了关东南部地区3.5 ~ 6.1级地震的震源参数。
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引用次数: 1
Numerical simulation of far-field tsunami using the linear Boussinesq equation. 利用线性Boussinesq方程的远场海啸数值模拟。
Q4 Earth and Planetary Sciences Pub Date : 2000-01-01 DOI: 10.2467/MRIPAPERS.51.17
Y. Tanioka
The dispersion effect is not negligible in the numerical simulation of far-field tsunamis propagating through deep oceans. Imamura et al. (1990) introduced a technique in which the discretization error in the finite difference equation of the linear long wave equation was used to approximate the physical dispersion term. The technique is widely accepted to compute trans-Pacific tsunamis caused by great earthquakes (Mw> 8). However, the technique has never been applied to compute tsunamis caused by smaller earthquakes (Mw< 7) because the approximation may break down. In order to compute the tsunami caused by the 1998 Papua New Guinea earthquake (Mw 7.1), we numerically solve the linear Boussinesq equation, which includes the physical dispersion term, using an implicit scheme. For comparison, we also compute the tsunami using Imamura's technique. The comparison of the computed waveforms at the ocean bottom pressure gauge off Boso (BS3-OBP) from the two numerical simulations indicates that the linear Boussinesq equation should be used to simulate the tsunami waveform more accurately, especially the later phase of tsunami waveforms. We also found that the observed tsunami that was originally generated by the 1998 Papua New Guinea earthquake and recorded at BS3-OBP was a ridge wave. The ridge wave was enhanced by the shallow water region around the Izu-Bonin Islands.
在深海远场海啸传播的数值模拟中,频散效应是不可忽略的。Imamura et al.(1990)介绍了一种利用线性长波方程有限差分方程中的离散化误差来近似物理色散项的技术。该技术被广泛用于计算由大地震(Mw bbbb8)引起的跨太平洋海啸。然而,该技术从未被应用于计算由较小地震(Mw< 7)引起的海啸,因为这种近似可能会失效。为了计算1998年巴布亚新几内亚地震(Mw 7.1)引起的海啸,我们使用隐式格式对包含物理色散项的线性Boussinesq方程进行了数值求解。为了比较,我们也用Imamura的方法计算了海啸。两次数值模拟的波索海底压力计(BS3-OBP)计算波形的比较表明,应采用线性Boussinesq方程更准确地模拟海啸波形,特别是海啸波形的后期。我们还发现,观测到的最初由1998年巴布亚新几内亚地震产生并记录在BS3-OBP上的海啸为脊波。伊豆小原群岛周围的浅水区增强了脊波。
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引用次数: 11
A Formula for Vertical Flux of Horizontal Momentum Generated by Topography. 地形产生的水平动量的垂直通量公式。
Q4 Earth and Planetary Sciences Pub Date : 2000-01-01 DOI: 10.2467/MRIPAPERS.50.125
H. Kanehisa
An approximate formula for the vertical flux of horizontal momentum (momentum flux for brevity) generated by topography is derived. A steady non-rotating hydrostatic 3-dimensional linear problem is considered. The height of topography is a function of both horizontal coordinates, and its environmental flow has vertical shears of both magnitude and direction. Because of the directional shear, critical levels are present continuously in the vertical direction. In the presence of the critical levels, the momentum flux vector is azimuthally filtered continuously in the vertical direction, and becomes a function of the vertical coordinate.   The formula shows that, except for the azimuthal filtering, the momentum flux vector is approximately the same as that for a uniform environmental flow, whose velocity is equal to the original environmental flow velocity at the ground.
导出了地形产生的水平动量的垂直通量(简写为动量通量)的近似公式。考虑一个定常非旋转流体静力三维线性问题。地形的高度是水平坐标的函数,其环境流具有大小和方向的垂直剪切。由于定向剪切作用,临界水平在垂直方向上连续存在。在存在临界水平的情况下,动量通量矢量在垂直方向上进行连续的方位滤波,并成为垂直坐标的函数。由公式可知,除方位滤波外,动量通量矢量与均匀环境流近似相同,其速度等于地面处的原始环境流速度。
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引用次数: 0
A Formula of Ekman Pumping for a Meso-scale Straining Flow. 中尺度应变流动的Ekman抽运公式。
Q4 Earth and Planetary Sciences Pub Date : 2000-01-01 DOI: 10.2467/MRIPAPERS.50.131
H. Kanehisa
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引用次数: 0
Measurement of Skylight Polarization with Surface Reflectance Over Railroad Valley, Nevada. 利用表面反射率测量内华达州铁路谷上空的天窗偏振。
Q4 Earth and Planetary Sciences Pub Date : 1999-12-20 DOI: 10.2467/MRIPAPERS.50.113
T. Takashima, K. Masuda, K. Arai
A multipurpose field radiometer (Optical Research Corporation Model MSR7000) was modified to measure the degree of polarization and radiance of skylight either on the ground or on a ship. The atmospheric observations were performed over Railroad Valley (38°32'N, 115°44'W), Nevada (USA) where the altitude is 1435m in wavelengths from 400nm to 1000nm. The polarization initially increased with increasing wavelength and reached a maximum of 70% at around 500nm. It then decreased with a further increase of wavelength. This trend might be explained by contamination of aerosols in the atmosphere if the surface reflectance is low. Furthermore, at fixed wavelengths polarization decreased generally with increasing sun elevation, whereas the surface reflectance factor increased. Based on a sun-photometer measurement, the atmospheric aerosols were stable during the measurements. In a simulation in which the surface is assumed to be Lambertian with a fixed reflectance, the skylight polarization decreased with increasing sun elevation. The observed magnitude of changing skylight polarization with solar elevation is smaller than that of simulated results. This might be mainly due to neglecting polarization generated by the surface and partly due to neglecting directional dependence of reflectance.
对一种多用途野外辐射计(光学研究公司型号MSR7000)进行了改进,用于测量地面和船上天窗的偏振度和辐射度。大气观测在美国内华达州的Railroad Valley(38°32'N, 115°44'W)上空进行,海拔为1435m,波长为400nm至1000nm。偏振度最初随波长增加而增加,在500nm左右达到最大值70%。然后随着波长的进一步增加而减小。如果地表反射率较低,这种趋势可以用大气中气溶胶的污染来解释。此外,在固定波长下,随着太阳高度的增加,极化系数普遍降低,而表面反射率系数增加。根据太阳光度计测量,大气气溶胶在测量期间是稳定的。在假设表面为固定反射率的朗伯曲面的模拟中,天窗极化随太阳高度的增加而减小。观测到的天窗极化随太阳高度的变化幅度小于模拟结果。这可能主要是由于忽略了表面产生的偏振,部分原因是忽略了反射率的方向依赖性。
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引用次数: 3
MRI GCM-IIによるアジアの夏季モンスーンのシミュレーションに対する水平解像度の効果 MRI GCM-II水平分辨率对亚洲夏季季风模拟的效果
Q4 Earth and Planetary Sciences Pub Date : 1999-01-01 DOI: 10.2467/MRIPAPERS.50.65
A. Chandrasekar, D. V. B. Rao, 昭雄 鬼頭
The MRI atmospheric general circulation model has been used to study the effect of horizontal resolution on the simulation of Asian summer monsoon. The model has been integrated for an eight year period with three different horizontal resolutions designated as Low (4°lat X 5°long), Medium (3°lat X 3.3°long) and High (2°lat X 2.5°long), respectively. The results indicate that the increase of horizontal resolution improved the simulation of mean sea level pressure and precipitation patterns. The high resolution model simulates a heat low and monsoon trough in agreement with the observations, while the low resolution model simulates an abnormal heat low over north India. The high resolution model simulates the precipitation maxima over the Bay of Bengal and the south Indian ocean, and a dry region over the Tarim basin better, while the low resolution model better simulates the precipitation maximum over the Arabian sea. All the models simulate weaker monsoon circulation while the increase of horizontal resolution leads to further weakening of low level monsoon westerlies. The results of this study conclude that the increase of horizontal resolution improved the simulation of many observed features of the Asian summer monsoon circulation, but certain features deteriorated indicating that the model parameterizations may need to be suitably modified.
利用磁共振大气环流模式研究了水平分辨率对亚洲夏季风模拟的影响。该模型已经集成了八年的时间,具有三种不同的水平分辨率,分别为低(4°纬度X 5°长),中(3°纬度X 3.3°长)和高(2°纬度X 2.5°长)。结果表明,水平分辨率的提高改善了平均海平面压力和降水模式的模拟。高分辨率模式模拟了一个与观测相符的热低压和季风槽,而低分辨率模式模拟了印度北部的一个异常热低压。高分辨率模式较好地模拟了孟加拉湾、南印度洋和塔里木盆地干燥地区的降水最大值,而低分辨率模式较好地模拟了阿拉伯海的降水最大值。所有模式模拟的季风环流减弱,而水平分辨率的增加导致低层季风西风带进一步减弱。研究结果表明,水平分辨率的提高改善了亚洲夏季风环流的许多观测特征的模拟,但某些特征恶化,表明模式的参数化可能需要适当修改。
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引用次数: 11
Dependence of Prevailing Visibility on Relative Humidity at Tokyo International Airport. 东京国际机场盛行能见度与相对湿度的关系。
Q4 Earth and Planetary Sciences Pub Date : 1999-01-01 DOI: 10.2467/MRIPAPERS.50.81
Susumu Iwakura, K. Okada
The relation between prevailing visibility and relative humidity measured at Tokyo International Airport was studied by taking aerosol mass concentration into consideration. The period used for the analysis is from December 1995 to March 1996, and from December 1996 to March 1997. An empirical equation which shows the relation was proposed and it has three parameters α, β and γ. The parameter α is the ratio of extinction coefficient (evaluated from visibility) to aerosol mass concentration in dry conditions. The parameter γ is an exponent which determines the ratio α (1-ƒ) γ at relative humidity ƒ. The parameter β is the correction value for measured aerosol mass concentration. In this study, the values of the parameters α, β and γ were calculated to be 3.0m2g-1, 32μgm-3 and -0.51, respectively. The value α -1 of 0.33gm-2 is almost the same as that of 0.32±0.02gm-2 reported by Waggoner and Weiss (1980), even if the cutoff radius of aerosols in this study (≤5μm) was larger than that in their measurements. The growth rate of aerosol particles with increasing relative humidity estimated in this study was equal to the value for the “normal” particles described in Kasten (1969).   The calculated visibility in another period of 15-21 February 1994 was obtained by using the parameters α, β and γ evaluated in this study, aerosol mass concentration and relative humidity measured during this period. The comparison showed that the calculated visibility coincided with observed visibility in this case.
在考虑气溶胶质量浓度的情况下,研究了东京国际机场的能见度与相对湿度之间的关系。用于分析的期间为1995年12月至1996年3月和1996年12月至1997年3月。提出了一个具有三个参数α、β和γ的经验方程。参数α是在干燥条件下消光系数(由能见度计算)与气溶胶质量浓度的比值。参数γ是一个指数,它决定了相对湿度下的比值α (1- f) γ。参数β是测量气溶胶质量浓度的校正值。在本研究中,α、β和γ参数的计算值分别为3.0 μgm- 1、32μgm-3和-0.51。0.33gm-2的α -1值与Waggoner和Weiss(1980)报道的0.32±0.02gm-2几乎相同,即使本研究中气溶胶的截止半径(≤5μm)比他们的测量值大。随着相对湿度的增加,本研究估计的气溶胶颗粒的增长率与Kasten(1969)中描述的“正常”颗粒的值相等。1994年2月15日至21日另一时段的能见度计算是利用本研究计算的α、β和γ参数,以及这一时段的气溶胶质量浓度和相对湿度。对比表明,在这种情况下,计算的能见度与观测的能见度吻合。
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引用次数: 1
Globally Balanced Equations for a Localized Meso-scale Disturbance Embedded in a Large-scale Flow. 嵌入大尺度流中的局域中尺度扰动的全局平衡方程。
Q4 Earth and Planetary Sciences Pub Date : 1999-01-01 DOI: 10.2467/MRIPAPERS.50.91
H. Kanehisa
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引用次数: 0
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Papers in Meteorology and Geophysics
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