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(www.interscience.wiley.com) DOI: 10.1002/qj.105 Variance scaling in shallow-cumulus-topped mixed layers

by R. A. J. Neggers, B. Stevens, J. D. Neelin
"... ABSTRACT: Scaling of thermodynamic variance in shallow-cumulus-topped mixed layers is studied using large-eddy simulation (LES). First, the performance of the top-down scaling (the turbulent flux at mixed-layer top divided by w∗) is evaluated for transient shallow-cumulus convection over land. The r ..."
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structure is shown to resemble a power-law function. The results suggest that the structure of variance in the dry convective boundary layer is similar to that in the sub-cloud mixed layer. In transient situations, the scaling reproduces the time-development of variance at sub-cloud mixed-layer top. The new

The struggle to govern the commons

by Thomas Dietz, Elinor Ostrom, Paul C. Stern - Science , 2003
"... Human institutions—ways of organizing activities—affect the resilience of the environ-ment. Locally evolved institutional arrangements governed by stable communities and buffered from outside forces have sustained resources successfully for centuries, al-though they often fail when rapid change occu ..."
Abstract - Cited by 661 (17 self) - Add to MetaCart
parties, officials, and scientists; complex, redundant, and layered institutions; a mix of institu-tional types; and designs that facilitate experimentation, learning, and change. In 1968, Hardin (1) drew attention to two human factors that drive environmental change. The first factor is the increasing de

Tor: The secondgeneration onion router,”

by Roger Dingledine - in 13th USENIX Security Symposium. Usenix, , 2004
"... Abstract We present Tor, a circuit-based low-latency anonymous communication service. This second-generation Onion Routing system addresses limitations in the original design by adding perfect forward secrecy, congestion control, directory servers, integrity checking, configurable exit policies, an ..."
Abstract - Cited by 1229 (33 self) - Add to MetaCart
by a symmetric key at each node (like the layers of an onion) and relayed downstream. The Onion Routing project published several design and analysis papers Perfect forward secrecy: In the original Onion Routing design, a single hostile node could record traffic and later compromise successive nodes

2009: A dual mass flux framework for boundary layer convection. Part I; transport

by Roel A. J. Neggers, Anton C. M. Beljaars - J. Atmos. Sci
"... The eddy diffusivity- mass flux (EDMF) approach for turbulent transport in well-mixed layers is extended into the modeling of shallow cumulus convection. To this purpose model complexity is enhanced in various key components, to enable representation of conditionally unstable cloud layers that are f ..."
Abstract - Cited by 26 (2 self) - Add to MetaCart
in the updraft ensemble, which is determined by the coupling between cumulus clouds and the sub-cloud mixed layer. This is achieved by defining and resolving two specific groups of updrafts; dry mixed-layer updrafts that never reach their lifting condensation level, and moist updrafts that condense and become

The evolution of a sub-cloud layer structure associated with a severe storm-a case study

by unknown authors
"... Using meteorological tower data from the NSSL (National Severe Storms Laboratory) in Oklahoma, evolutionary characteristics of a turbulent boundary layer are examined during the pre-storm and storm periods on May 20, 1977. Analyses include the vertical profiles of mean and turbulent quantities of wi ..."
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of wind, temperature, mixing ratio, momentum, and sensible and latent heat fluxes for the pre-storm and storm periods. The results indicate that a substantial modification occurs in the character of the lower boundary layer in each of these periods. In the pre-storm (no precipitation) the boundary layer

Trading structure for randomness in wireless opportunistic routing

by Szymon Chachulski, Michael Jennings, Sachin Katti, Dina Katabi , 2007
"... Opportunistic routing is a recent technique that achieves high throughput in the face of lossy wireless links. The current opportunistic routing protocol, ExOR, ties the MAC with routing, imposing a strict schedule on routers ’ access to the medium. Although the scheduler delivers opportunistic gain ..."
Abstract - Cited by 296 (7 self) - Add to MetaCart
gains, it misses some of the inherent features of the 802.11 MAC. For example, it prevents spatial reuse and thus may underutilize the wireless medium. It also eliminates the layering abstraction, making the protocol less amenable to extensions to alternate traffic types such as multicast. This paper

2004b), IntCal04 terrestrial radiocarbon age calibration

by Paula J Reimer, A J H Bertr, Paul E Damon, R Lawrence, Edwards Richard, G Fairbanks, Michael Friedrich, Thomas P Guilderson, Gerry Mccormac, Sturt Manning, Sabine Remmele, John R Southon, Minze Stuiver, Sahra Talamo, F W Taylor, Johannes Plicht, Constanze E Weyhenmeyer - Cal Kyr BP., Radiocarbon
"... ABSTRACT. A new calibration curve for the conversion of radiocarbon ages to calibrated (cal) ages has been constructed and internationally ratified to replace IntCal98, which extended from 0–24 cal kyr BP (Before Present, 0 cal BP = AD 1950). The new calibration data set for terrestrial samples exte ..."
Abstract - Cited by 222 (1 self) - Add to MetaCart
the calendar age and the 14C age to calculate the underlying calibration curve (Buck and Blackwell, this issue). The tree-ring data sets, sources of uncertainty, and regional offsets are discussed here. The marine data sets and calibration curve for marine samples from the surface mixed layer (Marine04

A simple model of the atmospheric boundary layer: Sensitivity to surface evaporation

by Ib Troen - Bound.- Layer Meteor , 1986
"... Abstract. A simple formulation ofthe boundary layer is developed for use in large-scale models and other situations where simplicity s required. The formulation is suited for use in models where some resolution is possible within the boundary layer, but where the resolution is insufficient for resol ..."
Abstract - Cited by 182 (4 self) - Add to MetaCart
. The model predicts growth of the convectively mixed layer easonably well and is well-behaved incases of weak surface heat flux and transitions between stable and unstable cases. The evolution fthe modelled boundary layer is studied for different ratios of surface vaporation topotential evaporation. Typical

Biogeochemical controls and feedbacks on ocean primary production

by Paul G. Falkowski, Richard T. Barber, Victor Smetacek - Science , 1998
"... Changes in oceanic primary production, linked to changes in the network of global biogeochemical cycles, have profoundly influenced the geochemistry of Earth for over 3 billion years. In the contemporary ocean, photosynthetic carbon fixation by marine phytoplankton leads to formation of;45 gigatons ..."
Abstract - Cited by 189 (2 self) - Add to MetaCart
fluxes are critically dependent on geophysi-cal processes that determine mixed-layer depth, nutrient fluxes to and within the ocean, and food-web structure. Be-cause the average turnover time of phytoplankton carbon in the ocean is on the order of a week or less, total and export

Analysis of variations in ocean color,

by A Morel , L Prieur - Limnol. Oceanogr., , 1977
"... Abstract: The dependence of the reflectance at the surface on the vertical structure of optical parameters is derived from first principles. It is shown that the depth dependence is a function of the derivative of the round trip attenuation of the downwelling and backscattered light. Previously the ..."
Abstract - Cited by 180 (7 self) - Add to MetaCart
the depth dependence was usually modeled as being dependent on the round trip attenuation. Using the new relationship one can calculate the contribution of the mixed layer to the overall reflectance at the surface. This allows one to determine whether or not to ignore the vertical structure at greater depth
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