scholarly journals Multi-Decadal Trends and Variability in Temperature and Salinity in the Mid-Atlantic Bight, Georges Bank, and Gulf of Maine

2018 ◽  
Vol 76 (5) ◽  
pp. 163-215 ◽  
Author(s):  
Elizabeth J. Wallace ◽  
Lev B. Looney ◽  
Donglai Gong
Keyword(s):  
River Discharge ◽  
Gulf Of Maine ◽  
Winter Season ◽  
Hudson River ◽  
The Other ◽  
Georges Bank ◽  
Spring Season ◽  
Science Center ◽  
Other Hand ◽  
Decadal Scale

Increasing attention is being placed on the regional impact of climate change. This study focuses on the decadal scale variabilities of temperature and salinity in the Mid-Atlantic Bight (MAB), Georges Bank (GB), and Gulf of Maine (GOM) from 1977 to 2016 using hydrographic survey data from the National Oceanic and Atmospheric Administration (NOAA) Northeast Fisheries Science Center. The MAB (as defined by the shelf regions from Cape Hatteras to Cape Cod) experienced warming rates of 0.57 °C per decade during the Winter/Spring season (Jan–Apr) and 0.47 °C per decade during the Fall/Winter season (Sep–Dec). The GOM and GB, on the other hand, warmed at approximately half the rate of the MAB over the same time span (1977–2016). We found that rates of warming vary on decadal time scales. From 1977 to 1999, significant temperature increases (> 0.6 °C/decade) were found in the southern regions of the MAB during the Winter/Spring season. During the same period, significant freshening (stronger than– 0.2/decade) was found in GB and the northern regions of the MAB during the Winter/Spring and Summer seasons. From 1999 to 2016, on the other hand, we found no significant trends in temperature and few significant trends in salinity with the exceptions of some northern MAB regions showing significant salting. Interannual variability in shelf salinity can in part be attributed to river discharge variability in the Hudson River and Chesapeake Bay. However, decadal scale change in shelf salinity cannot be attributed to changes in river discharge as there were no significant decadal scale changes in river outflow. Variability in along-shelf freshwater transport and saline intrusions from offshore were the likely drivers of long-term changes in MAB shelf-salinity.

scholarly journals Strengthening of the hydrological cycle in future scenarios: atmospheric energy and water balance perspective

2012 ◽  
Vol 3 (2) ◽  
pp. 199-212 ◽  
Author(s):  
A. Alessandri ◽  
P. G. Fogli ◽  
M. Vichi ◽  
N. Zeng
Keyword(s):  
Global Warming ◽  
Hydrological Cycle ◽  
Surface Fluxes ◽  
The Other ◽  
Mitigation Scenario ◽  
Budget Analysis ◽  
Other Hand ◽  
Large Perturbation ◽  
Decadal Scale ◽  
Global Precipitation

Abstract. Future climate scenarios experiencing global warming are expected to strengthen the hydrological cycle during the 21st century (21C). We analyze the strengthening of the global-scale increase in precipitation from the perspective of changes in whole atmospheric water and energy balances. By combining energy and water equations for the whole atmosphere, we obtain constraints for the changes in surface fluxes and partitioning at the surface between sensible and latent components. We investigate the differences in the strengthening of the hydrological cycle in two centennial simulations performed with an Earth system model forced with specified atmospheric concentration pathways. Alongside the Special Report on Emissions Scenario (SRES) A1B, which is a medium-high non-mitigation scenario, we consider a new aggressive-mitigation scenario (E1) with reduced fossil fuel use for energy production aimed at stabilizing global warming below 2 K. Our results show that the mitigation scenario effectively constrains the global warming with a stabilization below 2 K with respect to the 1950–2000 historical period. On the other hand, the E1 precipitation does not follow the temperature field toward a stabilization path but continues to increase over the mitigation period. Quite unexpectedly, the mitigation scenario is shown to strengthen the hydrological cycle even more than SRES A1B till around 2070. We show that this is mostly a consequence of the larger increase in the negative radiative imbalance of atmosphere in E1 compared to A1B. This appears to be primarily related to decreased sulfate aerosol concentration in E1, which considerably reduces atmospheric absorption of solar radiation compared to A1B. The last decades of the 21C show a marked increase in global precipitation in A1B compared to E1, despite the fact that the two scenarios display almost the same overall increase of radiative imbalance with respect to the 20th century. Our results show that radiative cooling is weakly effective in A1B throughout the 21C. Two distinct mechanisms characterize the diverse strengthening of the hydrological cycle in the middle and end- 21C. It is only through a very large perturbation of surface fluxes that A1B achieves a larger increase in global precipitation in the last decades of the 21C. Our energy/water budget analysis shows that this behavior is ultimately due to a bifurcation in the Bowen ratio change between the two scenarios. This work warns that mitigation policies that promote aerosol abatement, may lead to an unexpected stronger intensification of the hydrological cycle and associated changes that may last for decades after global warming is effectively mitigated. On the other hand, it is also suggested that predictable components of the radiative forcing by aerosols may have the potential to effectively contribute to the decadal-scale predictability of changes in the hydrological strength.

scholarly journals Semen Extender Ratio and Season’s Effects on Hatchability of Turkeys in Nepal

2018 ◽  
Vol 35 ◽  
pp. 77-83
Author(s):  
A. Subedi ◽  
S. Gurung ◽  
M. Sharma ◽  
S. Bhandari ◽  
N. Bhattarai
Keyword(s):  
Seasonal Variation ◽  
Milk Powder ◽  
Winter Season ◽  
Computer Software ◽  
Skim Milk ◽  
Skim Milk Powder ◽  
The Other ◽  
Seasonal Effect ◽  
Spring Season ◽  
Semen Extender

This study was carried out to identify the effects of season and semen extender ratio on hatchability of artificially inseminated turkeys of Chitwan, Nepal. Trials were conducted using four treatments of different dilutions of semen with skim milk powder in the ratio of 1:1 (T1), 1:2 (T2), 2:3 (T3) and 3:4 (T4). The 32 turkeys were artificially inseminated in 4 days interval for 3 months. The dose of insemination was 0.03 ml and insemination were done around 6:00 p.m. Trials were done in winter and spring seasons of 2017 to find out the seasonal variation on hatchability of turkey. The data were analyzed using GenStat3.6.2, computer software. The hatchability was noted on total eggs as well as fertile eggs. In total eggs, it was found that hens with T1 (67.80%) gave higher hatchability than T2 (63.82%), T3 (63.04%) and T4 (63.98%) whereas in fertile eggs, T3 (83.26%) and T4 (83.01%) gave higher hatchability than T1 (82.96%) and T2 (82.90%). Hatchability rate was almost similar in both spring and winter seasons in total eggs with non-significant differences. On the other hand, in fertile eggs, the hatchability rate was found higher in spring season. Similarly, seasonal effect on hatchability rate of various semen extender ratios in total eggs and fertile eggs was also carried out. In total eggs, T1 and T3 produced higher hatchability rate in spring than in winter; T2 had similar hatchability rate in both seasons and T4 had higher hatchability in winter than in spring. However, there were no significant differences on hatchability rate of semen extender ratio due to seasonal variation. In fertile eggs, all the 4 dilutions had more hatchability rate in winter season than in spring with significance (P<0.05). The hatchability was highest in T1 (85.19%) in winter season. The present study provides evidence that in total eggs of turkey inseminated with 1:1 semen dilutions provides more hatchability rate than other dilutions, whereas fertile eggs have more hatchability with dilutions 1:2 and 2:3 than others and hatchability rate based on total eggs is higher in spring than winter.

scholarly journals Effect Of Genotype, Age And Season On Hatchability Of Egg

1970 ◽  
Vol 37 (1) ◽  
pp. 17-22
Author(s):  
SS Islam ◽  
MB Hossain ◽  
MKA Khan
Keyword(s):  
Rhode Island ◽  
Age Groups ◽  
Winter Season ◽  
Winter Monsoon ◽  
The Other ◽  
Age Group ◽  
White Leghorn ◽  
Egg Hatching ◽  
Other Hand ◽  
Hatching Eggs

The study was conducted to study the effects of genotype and age of hen and hatching season on hatchability of egg. Hatching eggs were collected from hens having three genotypes viz. White Leghorn (WLH), Rhode Island Red (RIR) and Fayoumi covering three age groups (28 to 40, 41 to 60 and 61 weeks & above) at winter, monsoon and summer seasons. The study revealed that the highest (P<0.05) average hatchability was observed in winter (78.62%) followed by monsoon (76.70%) and summer (75.79%). Among different genotypes the highest (P<0.001) hatchability was found in Fayoumi (78.34%) followed by White Leghorn (76.48%) and Rhode Island Red (74.59%). Considering the age of hen, highest (P<0.05) hatchability was found in the age group between 41 to 60 weeks (77.99%) followed by 61 weeks and above (76.49%) and 28 to 40 weeks (75.71%) of age. From the findings it can be concluded that the winter season was suitable for hatching of eggs and the performance of Fayoumi hen was better in terms of hatchability of egg. On the other hand, the age of hen between 41 to 60 weeks was better for producing hatching eggs. DOI: http://dx.doi.org/10.3329/bjas.v37i1.9863 BJAS 2008; 37(1): 17-22

Comparative performance on plant morphology and biomass yield of two selected Moringa oleifera cultivars

2020 ◽  
Vol 49 (1) ◽  
pp. 91-99
Author(s):  
S Ahmed ◽  
MJ Khan ◽  
KS Huque ◽  
NR Sarker ◽  
MA Habib
Keyword(s):  
Moringa Oleifera ◽  
Biomass Yield ◽  
Block Design ◽  
Winter Season ◽  
Plant Morphology ◽  
The Other ◽  
Seasonal Effect ◽  
Initial Growth ◽  
Other Hand ◽  
Biomass Yields

Moringa (Moringa oleifera) could be one of the promising tree fodders to meet up the seasonal forage shortage in Bangladesh. Two cultivars of Moringa oleifera species namely Black Seed Moringa (BSM-L)  Local and White Seed Moringa (WSM-L) Local were cultivated at fodder research field in Bangladesh Livestock Research Institute (BLRI), Savar, Dhaka, Bangladesh during the period from August 2015 to December 2017 to determine plant morphology and biomass yield in different seasons of two consecutive years under common agronomical practices. The production performances of two Moringa cultivars were analyzed in an ANOVA of a Randomized Block Design (RBD). The result revealed that BSM-L had significantly higher survivability (89.12%, P<0.001), number of prune plant-1 (4.03, P<0.001) and lower defoliation rate (2.80%, P<0.04) than WSM-L(42.70%; 2.41 and 4.01%, respectively). On the other hand, leaf to stem ratio did not vary significantly (P<0.30) between cultivars (0.51 vs0.62). The annual fresh biomass yields (t ha-1) of BSM-L foliage (leaf+stem), stem and leaf (120.88, 84.14 and 45.07, respectively) were significantly (P<0.001) higher than that of WSM-L(33.71, 20.65and 12.67, respectively). On the other hand, the annual dry biomass yields (t ha-1) of BSM-L tops, stem and leaf (24.70, 14.49 and 09.85, respectively) were also significantly (P<0.001) higher than that of WSM-L (7.43, 3.93and 2.81, respectively). The seasonal effect of fresh foliage yield of Moringa showed that, dry& hot (March-June) (24.78 t ha-1/cut for BSM-L and 8.93 t ha-1/cut for WSM-L)and wet &hot(July-October) (31.48 t ha-1/cut for BSM-L and 6.85 t ha-1/cut for WSM-L)climates were found to be more suitable than dry & cool (November-February) (8.76 t ha-1/cut for BSM-L and 1.97 t ha-1/cut for WSM-L) climate. The initial growth of Moringa plants in the autumn or winter season was not satisfactory due to low temperature, humidity and rainfall. Results however, also showed that production of Moringa varied with variety and season. Finally, based on plant morphology and biomass yield, it may be concluded that, BSM-L may be cultivated as a potential tree fodder crop rather than WSM-L for ruminants in Bangladesh. Bang. J. Anim. Sci. 2020. 49 (1): 91-99

A study of cometary eruptions through OH radio-lines

1999 ◽  
Vol 173 ◽  
pp. 249-254
Author(s):  
A.M. Silva ◽  
R.D. Miró
Keyword(s):  
Short Duration ◽  
Growth Curves ◽  
The Other ◽  
Initial Mass ◽  
Radio Lines ◽  
Other Hand ◽  
Sudden Rise

AbstractWe have developed a model for theH2OandOHevolution in a comet outburst, assuming that together with the gas, a distribution of icy grains is ejected. With an initial mass of icy grains of 108kg released, theH2OandOHproductions are increased up to a factor two, and the growth curves change drastically in the first two days. The model is applied to eruptions detected in theOHradio monitorings and fits well with the slow variations in the flux. On the other hand, several events of short duration appear, consisting of a sudden rise ofOHflux, followed by a sudden decay on the second day. These apparent short bursts are frequently found as precursors of a more durable eruption. We suggest that both of them are part of a unique eruption, and that the sudden decay is due to collisions that de-excite theOHmaser, when it reaches the Cometopause region located at 1.35 × 105kmfrom the nucleus.

Closing the GAP—A 5Å Scanning Microscope

1969 ◽  
Vol 27 ◽  
pp. 6-7
Author(s):  
A. V. Crewe
Keyword(s):  
Normal Form ◽  
The Other ◽  
Resolving Power ◽  
Scanning Microscope ◽  
Conventional Microscope ◽  
Other Hand ◽  
Closing The Gap ◽  
Thermal Sources ◽  
Better Than ◽  
Transmission Microscope

We have become accustomed to differentiating between the scanning microscope and the conventional transmission microscope according to the resolving power which the two instruments offer. The conventional microscope is capable of a point resolution of a few angstroms and line resolutions of periodic objects of about 1Å. On the other hand, the scanning microscope, in its normal form, is not ordinarily capable of a point resolution better than 100Å. Upon examining reasons for the 100Å limitation, it becomes clear that this is based more on tradition than reason, and in particular, it is a condition imposed upon the microscope by adherence to thermal sources of electrons.

Life Beyond 1MeV

1980 ◽  
Vol 38 ◽  
pp. 30-33
Author(s):  
K.H. Westmacott
Keyword(s):  
Electron Microscopy ◽  
Past Experience ◽  
The Other ◽  
Good Case ◽  
Other Hand ◽  
The U.S

Life beyond 1MeV – like life after 40 – is not too different unless one takes advantage of past experience and is receptive to new opportunities. At first glance, the returns on performing electron microscopy at voltages greater than 1MeV diminish rather rapidly as the curves which describe the well-known advantages of HVEM often tend towards saturation. However, in a country with a significant HVEM capability, a good case can be made for investing in instruments with a range of maximum accelerating voltages. In this regard, the 1.5MeV KRATOS HVEM being installed in Berkeley will complement the other 650KeV, 1MeV, and 1.2MeV instruments currently operating in the U.S. One other consideration suggests that 1.5MeV is an optimum voltage machine – Its additional advantages may be purchased for not much more than a 1MeV instrument. On the other hand, the 3MeV HVEM's which seem to be operated at 2MeV maximum, are much more expensive.

Can the Academic Self-Concept be Positive and Realistic?

2005 ◽  
Vol 19 (3) ◽  
pp. 129-132 ◽  
Author(s):  
Reimer Kornmann
Keyword(s):  
Academic Performance ◽  
Opposite Effect ◽  
Self Esteem ◽  
Point Of View ◽  
The Other ◽  
Self Concept ◽  
High Ability ◽  
Self Image ◽  
Other Hand

Summary: My comment is basically restricted to the situation in which less-able students find themselves and refers only to literature in German. From this point of view I am basically able to confirm Marsh's results. It must, however, be said that with less-able pupils the opposite effect can be found: Levels of self-esteem in these pupils are raised, at least temporarily, by separate instruction, academic performance however drops; combined instruction, on the other hand, leads to improved academic performance, while levels of self-esteem drop. Apparently, the positive self-image of less-able pupils who receive separate instruction does not bring about the potential enhancement of academic performance one might expect from high-ability pupils receiving separate instruction. To resolve the dilemma, it is proposed that individual progress in learning be accentuated, and that comparisons with others be dispensed with. This fosters a self-image that can in equal measure be realistic and optimistic.

Stories and the Self

2020 ◽  
Vol 32 (2) ◽  
pp. 47-58 ◽  
Author(s):  
Stefan Krause ◽  
Markus Appel
Keyword(s):  
Meta Analysis ◽  
The Self ◽  
The Other ◽  
Lower Degree ◽  
Contrast Effects ◽  
Self Perception ◽  
Self Perceptions ◽  
Other Hand ◽  
The One ◽  
Implicit And Explicit

Abstract. Two experiments examined the influence of stories on recipients’ self-perceptions. Extending prior theory and research, our focus was on assimilation effects (i.e., changes in self-perception in line with a protagonist’s traits) as well as on contrast effects (i.e., changes in self-perception in contrast to a protagonist’s traits). In Experiment 1 ( N = 113), implicit and explicit conscientiousness were assessed after participants read a story about either a diligent or a negligent student. Moderation analyses showed that highly transported participants and participants with lower counterarguing scores assimilate the depicted traits of a story protagonist, as indicated by explicit, self-reported conscientiousness ratings. Participants, who were more critical toward a story (i.e., higher counterarguing) and with a lower degree of transportation, showed contrast effects. In Experiment 2 ( N = 103), we manipulated transportation and counterarguing, but we could not identify an effect on participants’ self-ascribed level of conscientiousness. A mini meta-analysis across both experiments revealed significant positive overall associations between transportation and counterarguing on the one hand and story-consistent self-reported conscientiousness on the other hand.

Don’t Put Me in This Group

2019 ◽  
Vol 50 (2) ◽  
pp. 80-93
Author(s):  
Jort de Vreeze ◽  
Christina Matschke
Keyword(s):  
Positive Emotions ◽  
Negative Emotions ◽  
Negative Information ◽  
The Self ◽  
The Other ◽  
Other Hand ◽  
Group Memberships

Abstract. Not all group memberships are self-chosen. The current research examines whether assignments to non-preferred groups influence our relationship with the group and our preference for information about the ingroup. It was expected and found that, when people are assigned to non-preferred groups, they perceive the group as different to the self, experience negative emotions about the assignment and in turn disidentify with the group. On the other hand, when people are assigned to preferred groups, they perceive the group as similar to the self, experience positive emotions about the assignment and in turn identify with the group. Finally, disidentification increases a preference for negative information about the ingroup.

Sign in / Sign up

Export Citation Format

Share Document