Application of a 2D‐CFDTD algorithm to the analysis of photonic crystal fibers (PCFs)

Zhu, Yanjie; Chen, Yinchao; Huray, Paul G.; Dong, Xiaopeng

doi:10.1002/mop.10502

Cited by 34 publications

(23 citation statements)

References 7 publications

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“…The increased light scattering could well be due to the particles hygroscopic growth demonstrated in other studies. For example, Mai et al (2018) found that AODs and SSAs both increased with relative humidity at Guangdong in the Pearl River Delta (PRD) region, which suggests that condensational growth can affect aerosol optical properties.…”

Section: Spatial Distribution Of Aerosol Single-scattering Albedomentioning

confidence: 99%

Spatial distribution of aerosol microphysical and optical properties and direct radiative effect from the China Aerosol Remote Sensing Network

et al. 2019

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Abstract. Multi-year observations of aerosol microphysical and optical properties, obtained through ground-based remote sensing at 50 China Aerosol Remote Sensing Network (CARSNET) sites, were used to characterize the aerosol climatology for representative remote, rural, and urban areas over China to assess effects on climate. The annual mean effective radii for total particles (ReffT) decreased from north to south and from rural to urban sites, and high total particle volumes were found at the urban sites. The aerosol optical depth at 440 nm (AOD440 nm) increased from remote and rural sites (0.12) to urban sites (0.79), and the extinction Ångström exponent (EAE440–870 nm) increased from 0.71 at the arid and semi-arid sites to 1.15 at the urban sites, presumably due to anthropogenic emissions. Single-scattering albedo (SSA440 nm) ranged from 0.88 to 0.92, indicating slightly to strongly absorbing aerosols. Absorption AOD440 nm values were 0.01 at the remote sites versus 0.07 at the urban sites. The average direct aerosol radiative effect (DARE) at the bottom of atmosphere increased from the sites in the remote areas (−24.40 W m−2) to the urban areas (−103.28 W m−2), indicating increased cooling at the latter. The DARE for the top of the atmosphere increased from −4.79 W m−2 at the remote sites to −30.05 W m−2 at the urban sites, indicating overall cooling effects for the Earth–atmosphere system. A classification method based on SSA440 nm, fine-mode fraction (FMF), and EAE440–870 nm showed that coarse-mode particles (mainly dust) were dominant at the rural sites near the northwestern deserts, while light-absorbing, fine-mode particles were important at most urban sites. This study will be important for understanding aerosol climate effects and regional environmental pollution, and the results will provide useful information for satellite validation and the improvement of climate modelling.

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Section: Spatial Distribution Of Aerosol Single-scattering Albedomentioning

confidence: 99%

Spatial distribution of aerosol microphysical and optical properties and direct radiative effect from the China Aerosol Remote Sensing Network

et al. 2019

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“…Land surface energy redistribution includes radiative process and nonradiative process (Burakowski et al, 2018;Burkett & Kusler, 2000;George et al, 2011;Kool et al, 2014;Mahmood et al, 2014). Direct meteorological observations were the most convincing way to illustrate the changes in temperature and other land surface process parameters (Zhang et al, 2002), especially in a very small region. With the development of remote sensing, large amounts of remote sensing data have been applied in the land surface processes related researches from mesoscale to global scale.…”

Section: Introductionmentioning

confidence: 99%

Impacts of Wetland Reclamation and Paddy Field Expansion on Observed Local Temperature Trends in the Sanjiang Plain of China

Liu

Zhang

2019

JGR Earth Surface

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The warming or cooling effects on regional climate in response to early land use change may be strengthened, weakened, or eliminated by the same or opposite effect in the subsequent land use/management period. Taking the Sanjiang Plain in China as our study area, this paper analyzed the surface temperature change due to land use/land management changes from the mid‐1950s to 2015, based on the land surface temperature response model and the observation minus reanalysis (OMR) method using remote sensing data, meteorological observation data, and reanalysis data. Results revealed a magnitude of monthly mean land surface warming up to 1.31 °C due to the land use change from wetland to rain‐fed farmland and a cooling effect of −1.32 °C caused by the land management change from rain‐fed farmland to paddy fields during the growing season. The trends were confirmed using OMR method. Land surface temperature change based on remote sensing data was divided into radiative and nonradiative forcing. The nonradiative processes play a dominant role in regulating the local surface temperature. The monthly mean temperature differences in response to land use changes differ greatly during the growing season. The temperature difference was greater in May and June (spring) than in July and August (summer). Our study shows that the land use impact on regional climate could be switched dramatically, and it would be basically consistent with the impact of natural wetlands before reclamation in our study area right now, which provides important information for mitigating and adapting to global climate change at regional scale.

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“…Conversion from marshland to CL could reduce albedo by enhancing the vegetation coverage during the growing season (Zhang et al, 2002), but increased albedo because of snow covered after harvesting the crops during the nongrowing season (Lobell et al, 2006). Compared with marshland, CL generally has a smaller ET due to low water content but has a larger ET from July to September (possibly due to strong transpiration from dense planted vegetation) (Figure 4).…”

Section: Discussionmentioning

confidence: 99%

Marshland Loss Warms Local Land Surface Temperature in China

Shen

Liu

Jiang

et al. 2020

Geophysical Research Letters

128

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China has the third largest area of marshland in the world. Due to the effects of human activities, marshland in China has been widely converted to built‐up land (BL) and cultivated land (CL) during the past decades. Using satellite measurements of land surface temperature (LST), this study investigated the biophysical effects of marshland loss on LST. The results showed that marshland conversion to BL could increase the LST during both the daytime and nighttime. Conversion from marshland to CL could increase the daytime LST in most months and nighttime LST in the nongrowing season but decrease the daytime LST from July to September and nighttime LST in the growing season. Conversion from marshland to paddy field and dry farmland had different effects on LST. These complex effects suggest that the biophysical effects of marshland conversions should be considered in evaluating the effects of marshland loss on climate change in China.

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Application of a 2D‐CFDTD algorithm to the analysis of photonic crystal fibers (PCFs)

Cited by 34 publications

References 7 publications

Spatial distribution of aerosol microphysical and optical properties and direct radiative effect from the China Aerosol Remote Sensing Network

Spatial distribution of aerosol microphysical and optical properties and direct radiative effect from the China Aerosol Remote Sensing Network

Impacts of Wetland Reclamation and Paddy Field Expansion on Observed Local Temperature Trends in the Sanjiang Plain of China

Marshland Loss Warms Local Land Surface Temperature in China

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