Transient simulations for present and last interglacials using a comprehensive coupled climate model CCSM3 (Community Climate System Model 3.0), links to model result files in NetCDF format

Transient simulations are widely used in studying the past climate as they provide better comparison with any exisiting proxy data. However, multi-millennial transient simulations using coupled climate models are usually computationally very expensive. As a result several acceleration techniques are implemented when using numerical simulations to recreate past climate. In this study, we compare the results from transient simulations of the present and the last interglacial with and without acceleration of the orbital forcing, using the comprehensive coupled climate model CCSM3 (Community Climate System Model 3). Our study shows that in low-latitude regions, the simulation of long-term variations in interglacial surface climate is not significantly affected by the use of the acceleration technique (with an acceleration factor of 10) and hence, large-scale model-data comparison of surface variables is not hampered. However, in high-latitude regions where the surface climate has a direct connection to the deep ocean, e.g. in the Southern Ocean or the Nordic Seas, acceleration-induced biases in sea-surface temperature evolution may occur with potential influence on the dynamics of the overlying atmosphere. The data provided here are from both accelerated and non-accelerated runs as decadal mean values.

Looking at the night sky

There are two series of images in this exhibition: Series # 1: Images 4 – 9 Astronomical observatories in different countries and telescopes which have made some important discoveries in science of astronomy. These images were taken with simple primitive camera including a homemade toy camera and a Holga pinhole camera. The toy camera use a simple plastic lens and film. It produces a very softly focused and blurred image. The Holga Pinhole camera has a panoramic format and also uses film. (The pinhole camera has no lens and only a very small pinhole to lets the light into the camera to produce a simple image) For me the limited resolution of these primitive cameras invoke a sense of wonder, mystery and imagination which the ancient observers must have experienced when looking at the night sky. Series # 2: Images 1 – 3 and 9 - 14 presents individual celestial objects including, the planet Saturn, the Moon, the Sun, a comet and a Star Cluster. All these images have been re-photographed through a number of large primitive lenses. Some are hand made glass lenses and others are hollow and filled with water. These primitive lenses distort and stretch the images and represent the way in which the lens and (the telescope) have changed our vision of the cosmos. They also represent the subjectivity of the lens, something that all photographers know about - just because we see something through a lens, does not mean that all has been revealed and that what finally perceive is both a combination of what we see and what we feel inside and our imagination. The toy and pinhole camera images were made during a 5 year period starting in 2010 and up to 2015. The second series have all been made during 2015.