Local-scale spatial modelling for interpolating climatic temperature variables to predict agricultural plant suitability     

Mathew A. Webb  Andrew Hall  Darren Kidd  Budiman Minansy 《Theoretical and Applied Climatology》2016,124(3-4):1145-1165

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North American extreme temperature events and related large scale meteorological patterns: a review of statistical methods,dynamics, modeling,and trends     

Richard Grotjahn  Robert Black  Ruby Leung  Michael F. Wehner  Mathew Barlow  Mike Bosilovich  Alexander Gershunov  William J. Gutowski  John R. Gyakum  Richard W. Katz  Yun-Young Lee  Young-Kwon Lim  Prabhat 《Climate Dynamics》2016,46(3-4):1151-1184

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Probabilistic seismic hazard map of Papua New Guinea     

Hadi Ghasemi  Chris McKee  Mark Leonard  Phil Cummins  Mathew Moihoi  Spiliopoulos Spiro  Felix Taranu  Eric Buri 《Natural Hazards》2016,81(2):1003-1025

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Prospect for UV observations from the Moon     

Margarita Safonova  Joice Mathew  Rekhesh Mohan  A. G. Sreejith  Jayant Murthy  Noah Brosch  Norbert Kappelmann  Arpit Sharma  Rahul Narayan 《Astrophysics and Space Science》2014,353(2):329-346

Space astronomy in the last 40 years has largely been done from spacecraft in low Earth orbit (LEO) for which the technology is proven and delivery mechanisms are readily available. However, new opportunities are arising with the surge in commercial aerospace missions. We describe here one such possibility: deploying a small instrument on the Moon. This can be accomplished by flying onboard the Indian entry to the Google Lunar X PRIZE competition, Team Indus mission, which is expected to deliver a nearly 30 kgs of payloads to the Moon, with a rover as its primary payload. We propose to mount a wide-field far-UV (130–180 nm) imaging telescope as a payload on the Team Indus lander. Our baseline operation is a fixed zenith pointing but with the option of a mechanism to allow observations of different attitudes. Pointing towards intermediate ecliptic latitude (50^° or above) ensures that the Sun is at least 40^° off the line of sight at all times. In this position, the telescope can cover higher galactic latitudes as well as parts of Galactic plane. The scientific objectives of such a prospective are delineated and discussed.  相似文献   

Kochi,India case study of climate adaptation to floods: Ranking local government investment options     

Supriya Mathew  Stefan Trück  Ann Henderson-Sellers 《Global Environmental Change》2012,22(1):308-319

Climate adaptation is uniquely linked to location, making it predominantly a local government and community responsibility. Despite the obligation to act, local governments are hindered by the absence of applicable guides to adaptation decision-making, especially adaptation to extreme events. In this paper, we describe a framework for prioritising adaptation options that could be locally implemented and illustrate it with a study of flooding in Kochi: a city in southern India. Unlike many demand driven, economics based studies, our new framework also incorporates non-economic dimensions of the extremes and potential adaptation options. Local knowledge is used to tackle data gaps and uncertainty related to extreme events: local experts select adaptation options that offer additional benefits besides those related to climate change. These co-benefits aid decision making under uncertainty by giving weight to community priorities. The Indian case study reveals that, risk evaluation and reduction need to be locally contextualised based on resources available, immediate community requirements, planning periods and local expert knowledge. Although there will be residual damage even after implementing selected options, we argue that, climate response will be most likely to be accepted when it also supports pressing needs.  相似文献   

Interferometric SAR for characterization of ravines as a function of their density, depth, and surface cover     

R.S. Chatterjee  S.K. Saha  Suresh Kumar  Sharika Mathew  R.C. Lakhera  V.K. Dadhwal 《ISPRS Journal of Photogrammetry and Remote Sensing》2009,64(5):472-481

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A software package for evaluating the performance of a star sensor operation     

Mayuresh Sarpotdar  Joice Mathew  A. G. Sreejith  Nirmal K.  S. Ambily  Ajin Prakash  Margarita Safonova  Jayant Murthy 《Experimental Astronomy》2017,43(1):99-117

We have developed a low-cost off-the-shelf component star sensor (StarSense) for use in minisatellites and CubeSats to determine the attitude of a satellite in orbit. StarSense is an imaging camera with a limiting magnitude of 6.5, which extracts information from star patterns it records in the images. The star sensor implements a centroiding algorithm to find centroids of the stars in the image, a Geometric Voting algorithm for star pattern identification, and a QUEST algorithm for attitude quaternion calculation. Here, we describe the software package to evaluate the performance of these algorithms as a star sensor single operating system. We simulate the ideal case where sky background and instrument errors are omitted, and a more realistic case where noise and camera parameters are added to the simulated images. We evaluate such performance parameters of the algorithms as attitude accuracy, calculation time, required memory, star catalog size, sky coverage, etc., and estimate the errors introduced by each algorithm. This software package is written for use in MATLAB. The testing is parametrized for different hardware parameters, such as the focal length of the imaging setup, the field of view (FOV) of the camera, angle measurement accuracy, distortion effects, etc., and therefore, can be applied to evaluate the performance of such algorithms in any star sensor. For its hardware implementation on our StarSense, we are currently porting the codes in form of functions written in C. This is done keeping in view its easy implementation on any star sensor electronics hardware.  相似文献   

Dynamics behind warming of the southeastern Arabian Sea and its interruption based on in situ measurements     

Simi Mathew  Usha Natesan  Ganesan Latha  Ramasamy Venkatesan 《Ocean Dynamics》2018,68(4-5):457-467

A study of the inter-annual variability of the warming of the southeastern Arabian Sea (SEAS) during the spring transition months was carried out from 2013 to 2015 based on in situ data from moored buoys. An attempt was made to identify the roles of the different variables in the warming of the SEAS (e.g., net heat flux, advection, entrainment, and thickness of the barrier layer during the previous northeast monsoon season). The intense freshening of the SEAS (approximately 2 PSU) occurring in each December, together with the presence of a downwelling Rossby wave, supports the formation of a thick barrier layer during the northeast monsoon season. It is known that the barrier layer thickness, varying each year, plays a major role in the spring warming of the SEAS. Interestingly, an anomalously thick barrier layer occurred during the northeast monsoon season of 2012–2013. However, the highest sea surface temperature (31 °C) was recorded during the last week of April 2015, while the lowest sea surface temperature (29.7 °C) was recorded during the last week of May 2013. The mixed layer heat budget analysis during the spring transition months proved that the intense warming has been mainly supported by the net heat flux, not by other factors like advection and entrainment. The inter-annual variability analysis of the net heat flux and its components, averaged over a box region of the SEAS, showed a substantial latent heat flux release and a reduction in net shortwave radiation in 2013. Both factors contributed to the negative net heat flux. Strong breaks in the warming were also observed in May due to the entrainment of cold sub-surface waters. These events are associated with the cyclonic eddy persisting over the SEAS during the same time. The entrainment term, favoring the cooling, was stronger in 2015 than that in 2013 and 2014. The surface temperatures measured in 2013 were lower than those in 2014 and 2015 despite the presence of a thick barrier layer. The substantial decrease in net heat flux along with entrainment cooling has been identified as causes for this behavior.  相似文献   

Wide-field ultraviolet imager for astronomical transient studies     

Joice Mathew  S. Ambily  Ajin Prakash  Mayuresh Sarpotdar  K. Nirmal  A. G. Sreejith  Margarita Safonova  Jayant Murthy  Noah Brosch 《Experimental Astronomy》2018,45(2):201-218

Though the ultraviolet (UV) domain plays a vital role in the studies of astronomical transient events, the UV time-domain sky remains largely unexplored. We have designed a wide-field UV imager that can be flown on a range of available platforms, such as high-altitude balloons, CubeSats, and larger space missions. The major scientific goals are the variability of astronomical sources, detection of transients such as supernovae, novae, tidal disruption events, and characterizing active galactic nuclei variability. The instrument has a 80 mm aperture with a circular field of view of 10.8 degrees, an angular resolution of ～22 arcsec, and a 240 - 390 nm spectral observation window. The detector for the instrument is a Microchannel Plate (MCP)-based image intensifier with both photon counting and integration capabilities. An FPGA-based detector readout mechanism and real time data processing have been implemented. The imager is designed in such a way that its lightweight and compact nature are well fitted for the CubeSat dimensions. Here we present various design and developmental aspects of this UV wide-field transient explorer.  相似文献   

Triassic Orogenesis in Southwest China: the Structural Origins of the Northeast Tibetan Plateau     

Mathew J. Harrowfield  Christopher J.L. Wilson WT  ”BX 《地学前缘》2000,(Z1)

TRIASSIC OROGENESIS IN SOUTHWEST CHINA: THE STRUCTURAL ORIGINS OF THE NORTHEAST TIBETAN PLATEAU  相似文献