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Tropical fish
Tropical fish are vibrant and beautiful. Some are shy, some are curious, and some are deadly! Learn these things and more alongside beautiful, full-color photographs.
Book
On the Spirality of the Asymmetric Rain Field of Tropical Cyclones Under Vertical Wind Shear
The downshear‐left enhancement of tropical cyclone rainfall has been demonstrated previously, but the radial dependence of this effect was not analyzed in detail. This study quantifies the progressive upwind shift of the wavenumber‐1 maximum rain position with radius relative to the vertical wind shear direction. This shift is visualized as a distinctive upwind spiral of the maximum. It is shown that this spiral pattern is generally observed across various storm intensities, shear strength, and ocean basins. Detailed examination revealed that the maximum downwind deflection angle of the wavenumber‐1 rain maximum relative to the shear direction is smaller for tropical storms than hurricanes, but insensitive to hurricane intensity. It is proposed that the spirality is produced by a continuous decline in angular advection of air parcels with radius. The stability of the deflection angle in hurricanes may be accounted for by a corresponding increase in vertical ascent under strengthening angular flow. Plain Language Summary Tropical cyclones (TCs) can produce torrential rainfall that generates floods, causing significant socio‐economic losses. Understanding the spatial structure of the TC rain field is crucial for improving disaster preparedness. The TC rain field can be thought of as the combination of a symmetric and an asymmetric part. By using a technique called Fourier decomposition, we can break down the asymmetric part into individual wavenumber components. The first component, wavenumber‐1 (WN‐1), is dominant and tends to be larger in the downshear quadrants under vertical wind shear. Using 21 years of global WN‐1 rain fields, we produced composite images aligned with the shear direction. We discovered that the positions at which the WN‐1 maximum occurs progressively shift upwind with increasing distance from the TC center, forming a spiral. We provided the first quantification of the observed spirals and showed that this is a general pattern that exists across different TC intensities, shear strength, and ocean basins. We also identified detailed changes in the pattern with storm intensity and introduced simple models as a first attempt to comprehend these changes. The findings can improve weather forecasts and risk predictions, making us better prepared for hazards associated with TC rainfall. Key Points There exists a general and progressive upwind shift in the wavenumber‐1 maximum with radius in global shear‐relative rainfall composites Maximum downwind deflection of the wavenumber‐1 maxima rises with storm intensity up to Category 1 on the Saffir–Simpson Hurricane Scale Linearity between the angular velocity and the vertical velocity of the storm may stabilize the downwind deflection beyond Category 1
Journal Article
Working to overcome the global impact of neglected tropical diseases: First WHO report on neglected tropical diseases
Neglected tropical diseases blight the lives of a billion people worldwide and threaten the health of millions more. These close companions of poverty weaken impoverished populations, frustrate the achievement of health in the Millennium Development Goals and impede global public health outcomes. Wider recognition of the public health significance of neglected tropical diseases and better knowledge of their epidemiology have stimulated necessary changes in public health thinking to approach and achieve control. This report presents evidence to demonstrate that activities undertaken to prevent and control neglected tropical diseases are producing results Ц and that achievements are being recognized.By 2008, preventive chemotherapy had reached more than 670 million people in 75 countries.
eBook
Setting up a tropical aquarium week-by-week
\"This encyclopedic reference presents clear, step-by-step, practical advice in a convenient week-by-week progression. From day one to week 12, detailed step-by-step photo sequences show you how to correctly set up a tropical freshwater aquarium and avoid the common pitfalls of fishkeeping so that you will have an aquarium to enjoy not for weeks or months, but for years, \"-- Page [4] of cover.
BOOK
Study of AR-, TS-, and MCS-Associated Precipitation and Extreme Precipitation in Present and Warmer Climates
Atmospheric rivers (ARs), tropical storms (TSs), and mesoscale convective systems (MCSs) are important weather phenomena that often threaten society through heavy precipitation and strong winds. Despite their potentially vital role in global and regional hydrological cycles, their contributions to long-term mean and extreme precipitation have not been systematically explored at the global scale. Using observational and reanalysis data, and NOAA’s Geophysical Fluid Dynamics Laboratory’s new high-resolution global climate model, we quantify that despite their occasional (13%) occurrence globally, AR, TS, and MCS days together account for ∼55% of global mean precipitation and ∼75% of extreme precipitation with daily rates exceeding its local 99th percentile. The model reproduces well the observed percentage of mean and extreme precipitation associated with AR, TS, and MCS days. In an idealized global warming simulation with a homogeneous SST increase of 4 K, the modeled changes in global mean and regional distribution of precipitation correspond well with changes in AR/TS/MCS precipitation. Globally, the frequency of AR days increases and migrates toward higher latitudes while the frequency of TS days increases over the central Pacific and part of the south Indian Ocean with a decrease elsewhere. The frequency of MCS days tends to increase over parts of the equatorial western and eastern Pacific warm pools and high latitudes and decreases over most part of the tropics and subtropics. The AR/TS/MCS mean precipitation intensity increases by ∼5% K−1 due primarily to precipitation increases in the top 25% of AR/TS/MCS days with the heaviest precipitation, which are dominated by the thermodynamic component with the dynamic and microphysical components playing a secondary role.
Journal Article
Sustaining the drive to overcome the global impact of neglected tropical diseases : second WHO report on neglected tropical diseases
The second WHO report on neglected tropical diseases builds on the growing sense of optimism_x000D__x000D_ generated by the 2012 publication of the WHO Roadmap. Commitments on the_x000D__x000D_ part of ministries of health in endemic countries global health initiatives funding_x000D__x000D_ agencies and philanthropists have escalated since 2010 as have donations of_x000D__x000D_ medicines from pharmaceutical companies and the engagement of the scientific_x000D__x000D_ community. _x000D__x000D_ This report marks a new phase and assesses opportunities and obstacles in the_x000D__x000D_ control elimination and eradication of several of these diseases. Unprecedented_x000D__x000D_ progress over the past two years has revealed unprecedented needs for_x000D__x000D_ refinements in control strategies and new technical tools and protocols. The_x000D__x000D_ substantial increases in donations of medicines made since the previous report_x000D__x000D_ call for innovations that simplify and refine delivery strategies. _x000D__x000D_ However some diseases including especially deadly ones like human African_x000D__x000D_ trypanosomiasis and visceral Leishmaniasis remain extremely difficult and costly_x000D__x000D_ to treat. The control of Buruli ulcer Chagas disease and yaws is hampered by_x000D__x000D_ imperfect technical tools although recent developments for yaws look promising._x000D__x000D_ The report highlights progress against these especially challenging diseases _x000D__x000D_ being made through the development of innovative and intensive management_x000D__x000D_ strategies. _x000D__x000D_ Innovations in vector control deserve more attention as playing a key part in_x000D__x000D_ reducing transmission and disease burden especially for Dengue Chagas disease_x000D__x000D_ and the Leishmaniases. _x000D__x000D_ Achieving universal health coverage with
essential health interventions for_x000D__x000D_ neglected tropical diseases will be a powerful equalizer that abolishes distinctions_x000D__x000D_ between the rich and the poor the young and the old ethnic groups and women_x000D__x000D_ and men.
eBook
Understanding of the Effect of Climate Change on Tropical Cyclone Intensity: A Review
The effect of climate change on tropical cyclone intensity has been an important scientific issue for a few decades. Although theory and modeling suggest the intensification of tropical cyclones in a warming climate, there are uncertainties in the assessed and projected responses of tropical cyclone intensity to climate change. While a few comprehensive reviews have already provided an assessment of the effect of climate change on tropical cyclone activity including tropical cyclone intensity, this review focuses mainly on the understanding of the effect of climate change on basin-wide tropical cyclone intensity, including indices for basin-wide tropical cyclone intensity, historical datasets used for intensity trend detection, environmental control of tropical cyclone intensity, detection and simulation of tropical cyclone intensity change, and some issues on the assessment of the effect of climate change on tropical cyclone intensity. In addition to the uncertainty in the historical datasets, intertwined natural variabilities, the considerable model bias in the projected large-scale environment, and poorly simulated inner-core structures of tropical cyclones, it is suggested that factors controlling the basin-wide intensity can be different from individual tropical cyclones since the assessment of the effect of climate change treats tropical cyclones in a basin as a whole.
Journal Article