Description
Web Map Service (MWS) Climate of the Municipality of Bremen.
Bioclimatic situation (climate function map):
The climate function map shows the functions and processes of nocturnal air exchange for the urban area of Bremen (flow field, cold air ducts). For residential and commercial areas, it represents the nightly overheating, based on the ground-level air temperature in an autochthonous summer night at 04:00 in the morning.
Bioclimatic situation of settlement areas (with cold air exposure area)
• Settlement areas in the exposure area of the cold air flow:
Settlement areas that are permeated by nocturnal cold air.
The cold air exposure area characterizes the ground-level outflow of cold air from the green areas into the
adjoining buildings during an autochthonous summer night. As a cold air exposure area, settlement and
commercial areas within the city area, which are characterized by an above-average
cold air volume flow or are characterized by a wind speed of at least 0.2 m s-1.
• Bioclimatic situation of settlement areas:
Classification of the bioclimatic situation into four classes (very favorable, favorable, less favorable, unfavorable) in relation to the local mean based on the z-transformed PMV value (predicted mean vote).
Settlement areas can be divided into sufficiently ventilated areas and thus mostly climatically favorable settlement structures as well as climatic stress areas. The nighttime overheating is due to the temperature difference to the green areas of the city. The heat island effect results as a deviation from this reference value and is therefore a more suitable parameter for recording the urban climate effect than absolute temperature values.
Bioclimatic importance of green and open spaces (cold air generation/production)
• Areas with very high cold air generation/production:
Green areas with very high cold air production are areas that have more than above-average cold air production in relation to the mean value in the examination room. They are marked by dot symbols. Selection criterion is a z-transformed cold air production rate greater than 1.
Cold air production areas characterize green areas with a significantly above-average cold air production rate and feed the cold air exchange areas or extend beyond them.
• Bioclimatic importance of green spaces and open spaces:
Classification of the urban climatic importance of green areas into four classes (small, medium, high, very high).
In the climate function map, green areas and open spaces are characterized with regard to their cold air supply capacity. Areas producing cold air (cold-air production areas) include unsealed open spaces (e.g. meadows, pastures and arable land) as well as green areas (e.g. park areas, allotments and cemetery areas) and forests characterised by loose vegetation. For the characterization of this compensation power, the cold air volume flow from adjacent areas is drawn in.
• Settlement areas with a climate-relevant function:
In individual cases, cold air can also be conveyed via settlement areas with low building density, low building heights and/or a high proportion of greenery. These settlement areas with very high cold air volume flows have a guideway similar function within the settlement area and are designated with a horizontal hatching.
• Air exchange:
Classification or evaluation of the cold air supply capacity of green areas in relation to the regional average (z-transformed cold air volume flow).
Cold air exchange areas connect cold air development areas (compensation rooms) and load areas (effect rooms) via (local or higher-level) cold air ducts or fulfill an important ventilation function and are therefore an elementary part of the air exchange.
Resources
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https://geodienste.bremen.de/wms_klima?SERVICE=WMS&REQUEST=GetCapabilities |